I have a 36g bowfront I am currently using as a growout. It started out with just a baby fire eel. Then I added a baby bristlenose to keep algae down. Then I added 10 neon tetras to try and calm the eel down and make him more comfortable. Then I added 10 black neon tetras because they were on sale for $1 at petsmart. Then I added a baby flagtail, just to fatten him up. Then came a baby adonis pleco. Then I added 5 baby clown loaches...so I think i'm pretty maxed out until I start moving fish to the big tank, lol.