i just started my first salt water tank. first day started off great, over flow was going good, return was awesome. then after a couple days of running i added a fan and a heater. here is a small video of how it looks before the fan and heater. so once i added those two items, now my overflow is sending the good amount of water to the filters however not alot reaches the return pump. any ideas as to why is this happening? do i need to add more water or slow my return? i have it set as is, i got it from waterbox all came with the tank. just want to prevent the return pump from messing up or make any alterations if needed to the filter sock/holder thank you all