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These are growing out of my live rock. Not sure what they are nor what family they are. Can someone shed some light on it for me?

So can anyone tell me what these are? They have started growing out of my live Rock. One is a purple bulb of some kind, while the other is Snow White and has little fingers sticking off the rim at the tip all the way around.

So I have my tank cycled, was about to add some cleaners and all of a sudden I have a brown algae growing everywhere and growing fast. My live rock is now brown. Brown spots are forming in the glass. It was like over night and wham. Is this good or bad and if bad how do I stop it? Tank has...

Ok, can someone tell me what this is?

Bought some live rock and now I am seeing a bunch of small white tubes with two small white (looks like string) tentacles coming out of them. Can anyone tell me if they are bad for my tank?

How long does it take to seed dry rock? How strong does the power heads need to be to support it?

I have a new tank, it has been many years since I have had a saltwater tank. like 20 years. there were none of the LED and T5 lights back then. what would you all recommend for a 36x30x18 that I may or may not down the road turn into a reef tank? it is acrylic and has a blue acrylic back.

So I Just picked up an 85 Gal acrylic tank, and I am going to build my own lighting system. Question 1, has anyone built these before? Question 2 my tank is 36Lx30Dx18W, what would you suggest I use to ensure Live rock and Fish health from top to bottom? not doing reef at this time, but may...