k so i made a thread before and got no responses, so i dunno if what i did before was the best thing to do or not. My 75 gallon has a built in overflow, and i have a magnum 350 connected to it, then the return is through the bottom of the tank. I have (had) a 258 GPH pump that i had put in the bottom of the overflow, then i filled the overflow with lava rock and put about 2 inches of filter floss on it. Everything ran fantastic for like a month, then i came home last night to a scene everyone hates to see, all my fish floating at the top gasping for air. even my dragon catfish (it's the most i've seen him in months), and my rubber lips plecos were WHITE, which was actually cool looking lol. Anyways, the 258 GPH pump decided that it didn't like my tank and died. I'm curious if it was just faulty and died or if it was my set up that caused it to die. I would love to set up a sump, and have my magnum 350 as a polisher and carbon from time to time, but my stand just has no room for it ( that annoying petsmart stand that has doors on each side? yes. thats the one. There's no room for even a 10 gallon, so i'm pretty hosed. any ideas?