I had an acuarium with 2 Fantails and I resently added 2 Black Moor. The problem is that the Black Moor are only swimming at the bottom so when I feed them, the Fantails eat everything and the Black Moor only get the leftovers that fall to the bottom. I'm worried that que Black Moor arent getting enough food and the fantails might be getting to much.
I hope nothing is wrong with the black moors. I suggest buying some sinking goldfish pellets. Feed those at the same time you feed the floating food so the fantails can be distracted eating that while the moors can eat on the bottom.