Originally Posted by Ziggy953
The sump does not have to be below the tank. If you put it above the tank you will need a pump that pulls water from the display and pumps it up to the sump. Let gravity work for you in returning the water from the sump to the display.
WOW I never saw anyone do this, in fact I never even heard anyone suggest it before. Not a good idea at all, IMO
The first issue is the pump. You would need to set aside a spot in the tank to have the pump where it doesn't suck anything into it (including air), plus a return pump isn't the smallest thing to have hanging or sitting in the tank.
You must also run plumbing from the pump to the sump. PVC
or flexible tubing running up and out of the tank might not look too nice.
The tank will constantly be dosed with microbubbles. The return water from the sump will be free flowing out of the sump and into the display, bringing with it a ton of microbubbles.
Then try to figure out how low to keep the water in the main so when the pump is off, it doesn't overflow from the sump free flowing back into it. I guess it can be done, but I would never attempt it or suggest anyone try it.