Are there any animals that live primarily on land, but hunt in the water. Preferably one that would eat mostly fry and small fish. I was hoping for a frog or something but maybe a crab would be more likely.
If you had stated a 20 gallon long I would have suggested African Dwarf Clawed frog.
The 29 high would be too tall and the African Dwarf Clawed Frog may struggle to get air. I agree should pass on the land piscavore.
Eastern newts? I had one and he was very fun to keep, but they are master escape artists, some times I would used to find him under my couch walking around. Would eat snails, smaller fish, bloodworms, and other stuff.