I just picked up a 90 gallon acrylic tank the other day off craiglist (love craiglist). He didn't have the pump for the wet/dry and had to go buy one and brought it to me. I hooked up everything, but the question I have is that the pump isn't returning as fast as it's hitting the wet/dry tank. I had a little mess to clean up and just want to know what is the cause of this. My guess is that the pump is to weak maybe? Just curious, because I'm fixing to message him to inquire about the pump and just want to make sure i'm correct before I send him a message.