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Can anyone tell me what these are and if they are good bad or indifferent? Something has been damaging my green mushrooms and I am wondering if this could be the culprit.

Not sure what this is. At first I thought it was an aptasia, but I am not really sure.

Originally Posted by SnakeBlitz33 is your alk at 2.9 dKH? If it is, then that is really low. calcium doesn't have as much to do with pH as alkalinity does. pH swings can be overted by running your refugiums lights to turn on when your main lights turn off. And, as said before, if you are...

Thanks for welcoming me! I test with a pinpoint digital ph meter. I keep my probe about midway between top and bottom of tank. My alk is 2.9 but I noticed my calcium is also low at 300ppm.

I have a 75 gallon tank. Recently I bought a new lighting setup for my tank. I went from a 260 watt unit to a 432 watt unit. Since I made the change my ph changes dramatically from 8.0 with lights out at night to 8.5+ during the day when they are on. Would a calcium reactor be a good idea...

Any one know what this is. Not sure if it is bristle worms or some kind of brittle star. It looks like several tentacles sticking out of the rock.