Largest Shark By Line 10 And 20 Gallon Tanks?

10 and 20 gallon tanks? - largest shark by line

I have a 10 and a 20 gallon tank where the fish will go in my ten gallons and must go into the GAL twenty.

SO Cat (big) eat my tetras, danios.
Panga (large) for peaceful purposes.
four line pictus cat (small) for peaceful purposes.
Common Pleco (4-5 inches) for peaceful purposes.
4 types (semi-wide) semi-aggressive to other fish.
5 tetras (average) for peaceful purposes.
2 danios (small) for peaceful purposes.