Will:

2 guppies
2 platties
2 dwarf gouramis
2 rosy barbs
1 african dwarf frog
4 bronze corydoras catfish
4 zebra danios
4 neon tetras
4 cardinal tetras
3 green barbs

be a good community. If not remove the unsuitable fish.

I see no major problems but have a few notes.

All the fish that you list except the dwarf gouramis like to be in schools. So, it's best to have 4 to 6 or more of each of a schooling fish.
Two dwarf gouramis may fight, certainly two males. Females or a pair may be okay if the tank is large enough.
The gouramis and green barbs (presumable green tiger barbs?) are the most likely to nip at other fish but in some setups, they are well behaved.
The guppies and platies like moderate hardness. All the other fish like slightly soft water.

How big is the tank? It's probably a good idea to be sure there's enough room for them and only add a few species at a time unless you have a fully cycled large aquarium ready to go.

I have a 250 gallon tank. I have tried it out. The green tiger barbs were nipping at first butt then they stopped. What other fish do you reccomend? The pet shop guy said a male betta, angelfish, altum angelfish or albino angelfish. I thought all those types of angelfish would munch my fish. The betta would be agressive. He also said ordinary tiger barbs, picto catfish, jewel cichlids, convict cichlids, chinese algae eaters, siamese algae eaters, mbuna cichlids and fiddler crabs are compatible. I think all the cichlids (with the exception of the convict and genyochromis mbuna) will be vegetarian but they will bully and be territorial too.
The siamese algae eaters will probably be ok but chinese algae eaters will harass tank mates. Genychromis mbuna are picivores generally hunting other mbuna but will take a chance to eat small fish too. Convicts normally graze on plants but like all neotropical cichlids they would love a neon tetra snack or a treat of a guppy too. Picto catfish are hunters too. Fiddler crabs may be peaceful with you if you hold one or be peaceful with tankmates but they need access to the surface. The store I went to was pets at home (I live in England so this store may not exist in America) to ask the shop keeper. Am I right or is he right?

I've never had cichilds but I know that most are territorial. Even those species that are pretty docile (and soft water) like angelfish, kribs, and rams can have feisty males when they're breeding. Those are the species I would try if you want cichlids. Angelfish may eat smaller fish like neons when they're grown. I don't think the betta would do much damage to your other fish unless you have some long-finned slow ones. I would be more worried about the betta being bullied since they're usually slower fish. I would not add jewel cichlids, convicts, mbuna cichlids, or fiddler crabs; that's asking for trouble. A Siamese algae eater should be okay. A Chinese algae eater would be fine at first but they can be boisterous when full grown. If the tiger barbs are behaving themselves, you could add more of their species (but maybe a different color).

The other species you already have also like to have more of their own kind, and most come in multiple color varieties so they can appear to be different species but are not. This livens up the tank if you're one who likes a lot of different kinds of fish. Personally, I'd rather have a few larger schools of the same fish than lots of tiny schools. It's a bit more natural, and the tank wouldn't look as "busy." So, I suggest getting more of the fish you have once the tank is cycled (except the gouramis as they're territorial with their own kind). That froggy in particular is probably lonely for a buddy.

It sounds like you know more than the shop keeper!

I've added another frog. It is an albino and is much larger than an existing frog. It is in quarantine. The betta and siamese algae eaters are in too. I added normal tiger barbs and albino tiger barbs. They ignore the betta. I added 2 kribs, a normal ram and a bolivian ram as wellas a young angel. They were transplanted from my theme tanks.

The fish I now have are:
4 guppies
4 sunset platies
1 betta
2 kribs
1 normal ram
1 bolivian ram
2 siamese algae eaters
1 young angelfish
4 rosy barbs
3 green barbs
3 albino barbs
1 tiger barb
4 cherry barbs
4 bronze corydoras
3 female dwarf gouramis
1 male dwarf gourami
2 dwarf frogs
4 neon tetras
4 cardinal tetras
4 zebra danios
1 gold danio
1 mystery snail

Will any other fish fit in this 250 gallon? So far I have african, asian
and american fish. I have a spare 500 gallon tank if this is overcrowded.
The albino frog is still in quarantine. Shall I add it? The betta is trying to breed with the gouramis.

You have quite a large number of species in there! Your tank could fit more fish but I suggest getting more of the schooling species so they are more comfortable.

The betta wants to breed with the gouramis? What is he doing?

Albino frogs are African clawed frogs. There are no albino African dwarf frogs. While the dwarf frogs are well behaved, the clawed frog will eat small fish as he gets bigger so I wouldn't add him if you want to keep your small fish around for long!

What size empty tank shall I move the clawed frog to? What is the exact number of extra fish I can add?

I also have a coldwater community with 2 weather loach, 2 bitterling and 2 ricefish.
Is this ok?

The African clawed frog should have at least a 5 gallon but 10 or 20 would be much better. They can get pretty big when full grown.

It's not really possible to say how many fish you could add (before it looks good, the ammonia spikes, or what?). It depends on their total weight, your water and maintenance schedule, and more. Some say 1" of skinny-type fish per gallon which would be 250" of fish. That seems like a lot. You really don't need to max out a tank just because you can. Your existing fish will grow and breed. If there's room, then you can keep more of the babies (and some many even survive all those hungry mouths by themselves). My tanks with fewer fish do better than my overcrowded (thanks to them breeding like mad) tank.

Your coldwater tank sounds ok but I don't know anything about rice fish.

Rice fish are small japanese fish. The coldwater tank is 30 gallon. Can I add more fish? I have an idea for a amazon tank with:

4 1 line pencilfish
4 angelfish
4 bristlenose catfish
4 leopard corys
4 bronze corys
4 lemon tetras
4 rummy nose tetras
4 ram fish

What size tank would i need for these? Are they compatible?

Ok, I have heard of rice fish. They are neat fish. I remember seeing them in a science catalog and looking into them. They carry their eggs right?

I wouldn't add more fish right away. Let everything settle in and see how things go.

Those 28 fish are pretty compatible. There's always the worry of angelfish getting along with each other and other fish, and they can eat small fish when the angelfish are grown up. Something like a 29 gallon tank would be large enough without the angelfish but since you want those, I would get something bigger, maybe a 40 gallon breeder to give the angelfish the room that they need.

The amazon tank is started up. I've added the lemon tetras and the angelfish. I have chosen a 40 gallon. I am hoping to breed fish in this tank. Can I add some white cloud or rosy red minnows to he coldwater tank? How many white clouds/rosyreds can i add to the 30 gallon?

I have added a pair of rosy reds and a pair of white clouds. The amazon tank is set up with all the fish. It has acid water. I would like a alkaline mbuna tank. Which mbunas (state their common names) are good? I know genyochromis mbuna are picivores.
Meanwhile in the amazon tank, I got a 55gallon and I added ram fish.

I have also heard albinos coem in any animal including ADF's. However ADF albinos are much rarer than ACF albinos.

As far as I am aware, there are no albino African dwarf frogs.

Sorry I don't know much about cichild species so I couldn't answer your Mbuna question.

I have an idea for another tank with:

1 Common goldfish
1 sarasa comet
1 comet
1 shubunkin
1 calico fantail

Will this work out?

That should be fine although I'd worry about the fantail getting beat up if she turns out to be female. I suggest at least a 50 gallon tank for 5 goldfish.

I have a 50 gallon tank now stocked with a common goldfish and a comet. The sarasa is in quarantine.

I am setting up a catfish tank with:

2 pictus
1 L-127 rare pleco
1 bristlenose pleco
1 common pleco
1 red tailed catfish
2 whiptails
1 L-034 rare pleco
1 twig catfish
2 syntodontis

Will this work out? How many gallons are best for these?

Well as nobody answered, I want to know if:

12 ghost shrimp
3 dwarf frogs
4 cherry shrimp
1 apple snail
8 guppies

Can live together? How big a tank is reccomended for them?

Those animals may be able to live together. I would worry about the ghost shrimp or frogs eating the smaller cherry shrimp. That's a lot of ghost shrimp. If not for them, I would say 20 gallons but with that many ghost shrimp in there, they'd attack and eat each other probably so more like 40 gallons at least would be in order for a dozen ghost shrimp, at least the big ones. Plus, a 20 gallon is on the lower side of room for an apple snail.

As cherry shrimp will be eaten, which other tropical shrimps are recomended?

If you took out the ghost shrimp (who tend to attack smaller shrimp), you could have some shrimp like red-fronted shrimp, larger cherry shrimp (the frogs might eat the smaller ones), Amano shrimp, etc.

I have now set up a 55 gallon with:

6 bumble bee shrimp
4 crystal red shrimp
3 wood shrimp
2 rainbow shrimp
2 red fronted shrimp
3 cherry shrimp
2 amano shrimp
8 guppies
1 apple snail
2 african dwarf frogs
1 golden clam

I keep the golden clam happy by adding pond water now and then to my tank.

Can you make a chatroom that is open on sundays?

I don't know how to set up a chatroom. I also wouldn't have time to go into it for moderation purposes. Plus, I have dial-up at home which is super duper slow!

I want to have a guppy breeder with 12 guppies and 5 mollies. How many gallons will I need?

I would have at least a 20 gallon tank. If you want babies, you'd have more luck with just guppies as the mollies may pester the guppies and eat their young.

Ok, it is set up

What about a tropical turtle tank?

What about a turtle tank?

Here's my page on turtle tanks:
http://www.fishpondinfo.com/turtles/turtank.htm