I have 3 tiger barbs 1 scissortail rasboris and 2 red claw crabs they have the right nitrite,nitrate and ph
what is LFS
I like pacu,pictus cats,invertabrates,black moor goldfish, oranda goldfish, barbs, green spotted puffers, and corys.
Aqua Boy
OK, the Tiger Barbs need a bigger group of arround 6, as do the scissortails. With these added, you would be about done untill the tank is about 6 months old, and then you can consider a few more. The tank has to mature before you think about raising your stocking levels any further.
It's all well and good saying the pH, ammonia, nitrite and nitrate are all fine, but that doesn't tell us much about them. They may well be fine for the current fish, but we don't know how your planned stocking will react to them. Can you give us numbers please?
Now on to what to consider further down the line;
pacu; way too big for a 20g
pictus cats; way too big for a 20g
invertabrates; Could you please be a little more specific. Invertibrates cover crabs, lobster, shrimp and snails....
black moor goldfish; these are coldwater fish, and thus aren't realy suited to your tropical set-up
oranda goldfish; these are coldwater fish, and thus aren't realy suited to your tropical set-up
barbs; You will be adding more tigers anyway to get their group up, more may make the tank a little "samey". If you do want to add another group, any type of barb other than Forontosa and Cherry barbs will be fine. The first get too large and the latter will be nipped by the tiger barbs. Aim with any barb, for a group size of 6
green spotted puffers; These aren't realy community fish, and will pick on any fish that doesn't eat them, and thats only because in that situation, the roles would reverse
corys; These would be the best choice. Any type would be fine. Larger corries would be good as a group of 4, and dwarf spiecies in groups of 6+
HTH
Rabbut