I honestly do not know how much it pumps out. Its meant for a 150g tank..I didn't realize until I received it
Okay, I get it.
So, the pump you're using is rated for a tank that is almost 3x larger than the tank it's on? Yes, that would be perhaps too much current for a small fish.
Beyond the many good suggestions above which should also work, here are some other options:
1) move the pump to the far end of the tank where it's easier for the fish to avoid
2) add tall plants around the outlet and between the outlet and the rest of the tank
3) jerry-rig a light cloth or sock (using rubber bands) around the outlet to slow down and disburse the current
4) flip the outlet or location so the outflow goes against the glass and not directly into the water
5) raise the outlet so it doesn't enter the water directly (noisier, but will work)
6) or, obviously, get a smaller pump (more cost, but perhaps unavoidable)