We talked some last night already, but I told ya... those prolly aren't goldfish. I haven't pinpointed what yet-- mind if I show a buddy your pic?
Filtration can be compensated for with frequent water changes. No need to go extra heavy for 'em. I was told for years the 20+ fish I have (had, sold some), were way too many in my 55 gallon, yet I have a 6" long cichlid in there, and he's about... 4 years old now. The other fish are 2-3 years. I change my water weekly, or bi-weekly when the ammonia rises.