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crushed coral used in refugium?? Hi, I am going to set up a 10G refugium. I dont haven live sand now but 20lb crushed coral. Is it possible to use cushed coral as substrate in the refugium instead of live sand?? Will it affect the growth of any macroalge? thanks a lot!

Hi, I would like to know the different of the effect of 6400k 175W and 10000k 175W metal Halide to Coral 1: heath 2: color 3: growth rate? THanks

Hi all, I just set up my calcium reactor and everything works fine except the CO2 regulator. When I turn the CO2 tank on ( no matter how much I turn), One of meter will go to 700PSI but the other meter always stay at 0 ( that should be set around 15-20 right?) ?? But when I adjust the needly...

Hi, I just found one 175W (14000V ??) metal halide bulb from electronic store at very good price. Can I use it for my tank?? Is there any different between those from electronic store and those from LFS?? Thanks again.