
Mine hung out at the bottom and at the top, as they got older they sorta started swimming around more. How small are yours? I had a hard time getting mine to eat Mirco worms, so I used tiny
brine shrimp with eye dropper and just make sure not to get any of the floating eggs into the tank with the babies. (As they got older I switched them to frozen daphina, bloodworms, and pellets, it took awhile but they soon started eating pretty much anything!) One time I saw one of the "larger" mirco worms sorta looking like it was attacking one of the fry. I stopped using them after that and I contacted the guy I ordered from and he wouldn't asnwer me. As far as the siponing goes I used a TINY one, as soon as the fry are at the point where they are free swimming and eating well it should be fine to. I had a small outside side filter on my tank with fish net wrapped around the tube to keep the babies from getting sucked up. Also I used a piece of plastic around the water flow area to break up the water flow to keep it from being to strong of a current. I hope this helps! (Attached is pic you can see they just ate Brine shrimp and some are at the bottom.)