Hi, I have a 20ghex and I had a 10g that wasn't working anymore so I had to put some of those fish in the 20g to save them. I have 1 male dwarf gourami and 2 females, 8 silvertip tetra, 4 sterbi cories and a female betta. and ghost shrimp. Ammonia is 0, Nitrites 0 and Nitrates 10. Can I keep them all in there??? They seem very happy.