Hi! I got 4 albino cory catfish about a week ago. They are in a 20 gallon long cycled tank with 1 rubber pleco, 5 glowlight tetras and a male betta. They seem to be very active. Water parameters are 0 ammonia, 0 nitrite, 5 nitrate and at 78°. This morning I noticed my largest cory has a large bulge in its belly. Since they are generally light pink, it shows through as almost a grayish color. I have dealt with sickness in other fish, but never these guys. Could it be a she and maybe pregnant? Or is she bloated or sick? Any advice would be super helpful!!