you could probably go in with a cordless drill and punch a series of holes in the rock to soften it up a bit.....how about this for boneheadedness....1) decide to plumb in a pony tank to the display....2) decide to upgrade the already over-worked skimmer.....3)measure skimmer section in sump and order appropriate expensive arse skimmer..... 4) realize after skimmer is ordered that a 12"x12" footprint skimmer wont fit in the 8" I have between the top of my sump and the bottom of the display
.....so......5) order custom sump.
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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