Hydrocynus Vittatus - Tigerfish. Up to 30"
Hydrolycus Armatus - Sabertooth. Up to 36"
I know someone who has both of these (a school of 5 Tigerfish and a Sabertooth) in a 150. They are still relatively small (not yet 1 foot). He is getting his 900 gallon set up for them and we are wondering if even that will be big enough.
I'd love to have a tank full of Frontosas but I don't have space for a 6 foot tank as they can grow up to 1 foot long.
-Charlie