Well I got board a coupld nights ago and my impeller for my filter on my AC20 was not working on my 2.5. I was also thinking on how I could make a funge for my 2.5 then it hit me. I took the 2.5 some broken acrylic, a tube of silicone, a 175gph power head, some aragonite sand and a intake tube off a hot filter. Siliconed the acrylic on attached ph to the intake tube added some sand and then elevated the tank a coupld inches and presto. Now all I need to find is some macroalgie.