Tideline aio 11.3 pump choice please

[stE26wy14]

So, they gave me a 200pgh pump and it's not working out in any way. It keeps draining the back into the tank, making the back dry, I put in my 25gph pump for rn, working ok, not really moving the top...
so what do you think I should have?
Thanks,
Stewy

 

[TX_REEF]

200 GPH seems like a lot for a tank that size, especially if it is not controllable to reduce power! 25 gph pump would keep your rear chamber full, but perhaps consider a DC controllable pump so you can tune the flow rate as much as you need, as low as 10%. I recommend nautilus pumps from reefbreeders, they are affordable with plenty of functionality and run silent: https://shop.reefbreeders.com/products/nautilus