live rock yes i do about 100plus pounds it started to grow a long time ago then stopped when i run the calcium at around 500 i see things turning purple but seems like it stress my aninomies seeded the tank before the little chips i put in there just faded tank has been up for about 6 yrs no corraline got some of that slow growing cherry red on some spots like overflows thats it no colars on the rock ; lighting oddessy light 3 -250 hqi 2 140 watt blue actinics about to switch that to 4 96watt actinics
Sound to me like you have a water flow issue. You stated you have it around overflows etc. Coraline loves vigorous water flow. Try adding a bigger power head/pump somewhere in the tank and see what happens.
if you get your chemistry right you can't stop it and will look back fondly to the days your tank wasn't pink. alk=4.00 calcium =420 magnesium = 1360 water 78 degrees good flow. this is the formula for happy and healthy tanks. when you are here the pink will follow. good luck
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