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Does anyone know of a good refractometer and where I could find one online? A link would be awesome. I tried to search earlier and there are too many to choose from, I was confused

I recently bought a pink tile starfish that looked great. He was very active and colorful. This morning I woke up to a dead starfish that looked as if it had been attacked by something :( the only thing I know of that could have attacked it are my hermit crabs but I thought they were compatible...

I have had my tank running with fish and live rock for about a year. I tested my water about 3 days ago and suddenly my nitrates and ammonia have spiked pretty high for no apparent reason. Fish seem normal. Any reason for this? Water changes don't seem to be helping much, by morning there is...

I have a chocolate chip star and I want to add an orange linkia.... Are they compatible? I have heard that chocolate chips will eat lots of things and are not reef safe, but they won't kill an orange linkia right?

I have a small blue tang that has ich pretty bad and I'm afraid I'll lose him if I don't try to treat it. I have a cleaner shrimp and he doesnt even attempt to clean the tang, but I have starfish and some other inverts so I can't treat the tank. Any safe natural ways to try and get rid of it...

These little white creatures are all over EVERYTHING in my tank- glass, heater, live rock, decorations... Some are small and some are large. They don't move from what I can tell and the larger ones seem to have some small antennae... Any idea? They appeared in a matter of a week it seems.

So this came with my live rock... Anybody know what it is? Thought it might be a coral but I'm not sure