Are you sure it tuffa? If so look into what people think about using it in a saltwater tank. I personally would not recommend using it. It too porous. It can accumulate debris very quickly becoming a source for bio-organic phosphate. I had one piece of either lava or tuffa. I couldnt tell as it was from a bunch lr I picked up from someone and was colored up. I thought it was a cool shape so I took it. After some time in my tank I noticed that the only piece of "base" rock in my tank seemed to be the epicenter of a minor hair algae outbreak. Needless to say since the piece has been removed I have no hair algae in my tank. Just a suggestion.
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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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