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Is this dangerous? I have an identical one and two others that are also identical. I had a two inch crab that had this stuck to it after it molted, and was dead. I think it killed my crab.

The white furry thing? I've been getting more and more, they're even bigger in my sump

So my crab is eating my corals and just clearing life on the out side of my live rock. I don't have a refugium, and I'm needing some step by step guide of what I need to create one. My tank is 55 gallons, I have a sump with protein skimmer. When I bought all my equipment from my lfs they didn't...

So I found out that my emerald crab is a spider decorator crab :0( he's wearing all all of my yellow polyps

My aquarium has been running for almost 5 months now and I keep finding hitch hikers! Also some frag corals I got yesterday. I took two pics of each, one when I first put them in and a second an hour later. I'm very new with this and trying hard to learn to establish a perfect ecosystem for my...

I can't seem to find any pis of the sponge?? Clam? Or the filter feeder on the clam??

Stony coral?

Don't know what it is. A polyp??

Is this crab good or bad. I came home found it on my soft sponge. I thought he was cleaning, then he was ripping off a piece. I'm so distraught. He seems to be eating a lot of stuff on my live rock. Don't know what to do. I recently found him, hitch hiker

I came home from work and find my hitch hiker emerald crab eating my soft sponge. What do I do? I thought at first he was cleaning it, but no he was eating. Are emerald crabs bad??? I have a video but I don't know how to upload it.

How many hours of light should my tank have? Right now my lighting hours are terrible. They're on all night while I'm away at work 13 hours. I just bought a timer for my lights. Please help. The lights I recently bought dont have moonlight only option. I have one blue and one white light. My...

Noticed this last week and today an even smaller one in the pic as well. Should I worry? Does it get bigger?

It does not have a hard shell and it travels all over my aquarium!

Which type of live rock is better, Fiji or Florida? I have two Florida live rock. Can I mix them?!!

I'm very new, my aquarium gas been running 4 months now. I've got two damsel fish, very small clean up crew (snails/hermit crabs), a cleaner shrimp, an urchin, a stony coral, soft coral and some cute/weird live rock hitch hikers!!!!! I'm getting more live rock and gonna try to aqua scape...

Im new to the hobby of reef aquarium! I'm needing lots of advice!!