Question: Tanks and Babies

[berriicrush]

I have my 3" babies in a large hospital tank right now (around 20 gal), but I want to make the move to a 55 gal; however, I don't want the space to stress them out. With them having to swim to the top when they want attention. How do you make the transition or is it best to keep them in the hospital tank until then?

Also in the temporary, I have a filter, air stone, plants and hides for them, so it's pretty comfy. I just personally don't like the look of it.