Originally Posted by LilBangarang
This morning, I did a major water change as my tank was looking particularly nasty. I vacuumed all the gravel and went to top the tank back off. When I got the water level back to normal, my undergravel filter spouts just started spewing all of the debris trapped underneath. I managed to net a good amount of it out after turning off my UG because it showed no signs of slowing down. I have a 40 gallon with an Emperor 400.
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When I was running a UG filter this would occur from time to time. It is possible that the mulm and debris resting on the bottom of the tank (below the UG plates) became disturbed when new water was added back to the tank.
To prevent an substantial buildup under the plate, there are a few things you can try:
Take a length of airline hose and push it into the UG riser tubes (under the plates) and spin the tubing. This should help dislodge any debris. Next, insert the water change siphon into one of the UG riser tubes and draw out the foul water.
Depending on how you stand is built, if it is an open bottom (meaning, you can access the bottom surface of the tank from below then drop a stainless steel washer down one of the UG riser tubes. Then, using an algae magnet (or any magnet), drag the washer around the bottom. Again, do the water change from one of the riser tubes to remove the debris.
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