Got me some cardinal tetras. They seem to have adapted well, water parameters very good, they swim nicely, not hiding it any unusual behaviour. Problem is, that never come up top for feeding and even when the food starts to sink, they are interested but are not managing to gobble food down. I have tried crumbling tetra flakes and tried Omega One micro pellets. The micro pellets seem too big for them. They spit them right back out. I tried crushing them but sink way to fast that way. They are really small tetras. Why are they not eating ? Or they are eating but minuscule amounts that I can not detect?