Ahh, I'm so glad i signed up for this! Helped me a lot, but I'm struggling, i have a smallish tank (15 gallons) and all i've got at the moment is 4 black widow tetras, what else should i put in there?!:')
that's all down to personal preference.. i like otocinculs there a cool type of fish. i also like neons and shrimps but at the end of the day its down to you =]
black widow tetras are also called black skirt tetras. On this site you can view which fish are compatible to yours: http/tropicalfishandaquariums.com/Compatibility/index.php
how long has it been cycled for ... and the simple answer when both nitrites and ammonia read 0 on a test kit, id add 1 fish at a time to prevent a big ammonia spike