First of all im new here 
I am currently setting up 55 gal tank. I an undergravel filter with two 70 g filters.
I am either deciding on an Oscar, a Jack Dempsey, or a Green Terror.
I know i can only keep one Oscar in there, but if i decide on a JD or a GT can i put two GT's or two JD OR one GT one JD?
Thx for the advice

I am currently setting up 55 gal tank. I an undergravel filter with two 70 g filters.
I am either deciding on an Oscar, a Jack Dempsey, or a Green Terror.
I know i can only keep one Oscar in there, but if i decide on a JD or a GT can i put two GT's or two JD OR one GT one JD?
Thx for the advice
