Could a continuous current in the tank exhaust fish to death?like a 30 liter/min in a cylinder tank with outlet at the bottom.
Do you know how many gallons? Your water pump is pumping out 480g/hr. which is pretty strong. Is this pump being used as part of a sump filter or is it going directly into the tank?
for BIG BIG.
Thats like going to get wood for a DIY tank stand and you tell the Guy BIG BIG, when he asks what length your looking for.