I've posted this question before but have not had money to buy fish. I have a 29 gallon biocube that I'm going to stock this month. So far I have two fire dwarf gourami's ,1 golden dojo, 1 daino, 1 hatchetfish, and 4 penguin tetras.I am going to get rid of the hatchet and the daino, and get 2 more gourami's. Could I get 2 more penguin fish or would my bio load be too high?