chytilmo Posted February 28, 2015 Share Posted February 28, 2015 I have a 100 gallon tank I recently purchased used. It has a center overflow with a bottom drain that hooked to a wet dry trickle and two returns, one in each corner of the tank. It also has two holes drilled on each side of the overflow, one mid tank and one closer to bottom. The midlevel hole appears to be 1 inch while the lower hole appears to be 3/4. I am not sure if these were used in a closed loop system or plumbed in to the wet dry filter. Any input on how they would be used would be appreciated. This will be my first attempt at plumbing a drilled tank so any ideas would surely help.Thanks Link to comment Share on other sites More sharing options...
madsalt Posted February 28, 2015 Share Posted February 28, 2015 Can you post any pictures, they are worth a thousand words you know, not to mention it would help us see what you see Link to comment Share on other sites More sharing options...
Sascha D. Posted March 2, 2015 Share Posted March 2, 2015 If the holes are drilled in the back of the glass then they were for a closed loop. Link to comment Share on other sites More sharing options...
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