They used to have 5 gallon each. But there are 4 of them and the others are still in a 1 gallon plexicrap petsmart special. How heavy should I plant? I have a 75 and a 55 I can pull from, those are just smaller plants.
A heavy as you dare. I would plant along the back and sides, densely in the corners and leave the center open. Maybe put something like empty pots or pvc piping covered in moss in the center so they can each have a hidey hole.