Hi there
I have a 90ltr tank, In have 5 tiger barbs, 2 zebra danios, 3 sword tails, I black shark with a red tail (can't remember what he is) 6 neon tetras, 2 platies, 2 albino sucker fishand a couple of small cat fish for the bottom I did buy some more neons in the weekend and put them in. All up i have about 25 fish do you think i might have to many??? I haven't had my water tested i will go to animates on Sat and get that done. I did however when i took out the undergravel filter i gave the tank a good clean as the water was black.