i need help

[bluefish101]

im in seventh grade and next year im supposed to teach the seventh graders about acid rain cuz i proved my science teacher wrong by finding 30 diffrent fish that arnt affected so i need to build an aquarium with easy to get fish that can stand the foloing ph 5.5-6.0 my thirty wont work cuz they require to large a tank

[cocoa_pleco]

tetras are your best bet, they like soft water and so do discus

[bluefish101]

thanks any particular tetra?

[cocoa_pleco]

i think neons and cardinals are best

[bluefish101]

thanks an in my 20 g tank i have tree pregnant fish what should i do?

[cocoa_pleco]

what kind of pregnant fish? If its a small fish like a tetra or danio or platy get a separate 10g for the fry, and if its a godzilla fish like a oscar or something you need a large tank