I think your plan to raise the return pump would cause you noise issues....if the return pump is just below the water line in the sump it will draw in air.....if it were me, I would buy a brand new 20g tank and drill it, then swap everything over......the cost of doing this would probably be less than buying a lifereef overflow.......
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260g mixed reef, 105g sump, water blaster 7000 return, Bubble King SM 300 skimmer, Aqua Controller Jr, 4 radions, 3 Tunze 6055s,1 tunze 6065, 2 Vortech MP40s, Vortech MP20, Tunze ATO, GHL SA2 doser, 2 TLF reactors (1 carbon, 1 rowa). http://www.canreef.com/vbulletin/showthread.php?t=50034 . Tank Video here http://www.vimeo.com/2304609 and here http://www.vimeo.com/16591694
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