I have a 28 gallon euro aquarium with a marineland stealth pro heater, marineland penguin bio-filter, digital LCD themometer, sand substrate, and 4 giant black stones. I was wondering if 12 albino Cory catfish and 1 veiltail female betta would be overstocking the tank. If anything, I want it understocked! I really don't want a fully stocked tank! Also if it makes a difference im using fishless cycling! I don't know about decorations yet I found some natural decor and caves on petsmart I like and if I can find any marimo balls.