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Recent content by BigMoCotton
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Amazon shows the FX4 rated at 700GPH. Seems like a lot for a 55. Just modifying it with a spray bar should nerf it down to a comfortable level. The actual Fluval Spray Bar Kits are hard to come by but a piece of black PVC with some holes drilled and one end siliconed should work just fine.
I would grab a King-125. You can pick one up at PetCo for around $15. Reliable budget powerhead in my experience. I think you could achieve the effect you're looking for without having it so close to the bottom that it would obliterate the fish and substrate. There's always room to play with the...