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You can always run the mp40 slower, and try different modes, I personally like the short pulse mode, which creates a more realist ocean current imo
Then they aren't healthy. The ocean has way more flow than an mp40 at the lowest setting. Are you sure they are having trouble rather than just swimming against the current? My firefish can easily dart through an mp40qd at 75% if frightened. Can you take a video?My little fish even at the lower speed seem to have trouble swimming around. I have a yellow assessor and a firefish.
Run yellow that's reef crest which varies throughout the day and keep it on 3 or 2 or 3 dots for the setting if your tank is only 36" and your worried. Studies have shown that fish in high flow tanks are much healthier and live longer. Not only that it oxygenates the water, stabilizes ph, keeps detritus suspended, and reduces some nuisance algae/cyano/diatoms/dino.
Is your powerhead located on the top 1/3 of the glass? Then flow will be stronger up high and minimum lower.

