In my 45 gallon. i have three small and cute severums. The biggest is maybe 1.5 inches, but i'm thinkin' he's about 1.25 inches, and the other is about the same. The thrid is smaller ~ a inch. It is a planted tank that is 3 weeks old. There are lots of hiding places and some driftwood chunks. I have a 6.5 inch Lima Shovelnose that i want to add in with them. i'm thinking that the severums are yet to small. I have only had them for a few days and they get feed bloodworms twice a day to beef them up and to keep them healthy. They eat all of it . I also wanted to add a gold nugget pleco in their. Are they algae eaters or carnivorus like zebras?