So my "Electric Yellow" Cichilds are almost 6 months old and are growning out of their current tank, so its time to upgrade. Im trying to keep it below $1000 cdn for tanks, filters, heater ETC. The biggest i can go is 125, but something that big can be pricey so below 100 is good too. Whats the best tank?, i currently have a 36, so a 75 would be double, is a 75 big enough?