there is a good chance it needs more direct flow then what it is getting…though mp10s are great, how big is the tank? and what settings are you using?
i have a WP10 in my tank so not quite as nice as the mp10, but it still moves a tonne of water, my tank is only 5g though, i have mine set on a wave setting with flow on the lowest setting and the pulses set as far part as they can go, looks like about 10sec or so between pulses…i can still see areas in my tank where the water doesn't seem to be moving all that much. (poop is settling there) but all my leathers get pretty much blasted with flow…and light for that matter…leds as well.