So currently i have a pair of hystrix male is 6" and female is over 7" in a 60"x32"x18.5" tank. im really looking to expand my ownership of rays. Im looking to pick up 1 leo, possibly 2. also perhaps a marble. Id be looking to breed the hystrix as well as the leos (obviously in the future) So my question is on the tank. Im looking at the height of 20"-24", but the length and width are stumping me. Do i go 6'x3', 7'x3' or 6'x4' or 7'x4' the space i have wont allow for an 8' tank. please let me know your guys thoughts. thanks.