I have a 40 gallon aquarium with 3 Different types of Cory equals to; 3 Panda, 3 Sterbai, and several Julii cory's, 4 algea eating snails, 8 tetras and 5 male guppies. Very planted with round gravel for Cory comfort, and 3 different shelters with floating plants for guppies enjoyments and baby cory's as they keep on multiplying.