Thank to Sgt. Ray in my shop, I have been able to upgrade my younger sister's Goldfish tank. There are 2 fancy tail goldfish, 1 common goldfish, 2 otocinclus catfish, and one male crowntail beta. For filtration, I have 2 Tetra Whispers on the back (upgrading to the one for ~60 gallons soon) and 2 b