Thanks everyone! I will go ahead and paint tomorrow. I will transfer the little ones into another tank and cover the painted tank to be with plastic wrap as well as the roach tank. It says completely dry in 2-4 hours, so should I wait longer than 4 before placing them back?

EDIT: Ok, I guess it would be easier/better to take the paper approach if they will let me return the paint, wonder if menards sells the construction/contact paper. Can you link me to some so I can an idea of what paper to get exactly since I don't think construction paper comes in rolls.