It's a 75 read his signature. Sunny I hope you bought one if you are going to try and help out. Get some experience with them. But as for Jarret how low into the tank do you have it and how far from the nearest rock? I assume it is hitting a rock directly and not it is not far from the rock, pushing water down towards the sand. Try moving the MP 40 left or right or even higher. I personally think 2 MP 10's would work better in a 75 then a MP 40.
i dont think they would survive in that area lol. i have no idea how the percentage works i have 4 leds not lit on the controller. and i have played around with the speeds still blows sand. i have that fiji pink sand so its basically the finest sand you can buy. obv not good to have with an mp40.
na i have knocked power down to it and its the same issue it blows the sand no matter what.