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Had my tank for about 4 years now and found the creature in the picture for the first time, I have only added a algae blenny to the tank this year so he must have been in the tank a while and I only spotted it about 3:00am so may be hard to find again!!! Has any one any ideas what it is?? I...

My shrimp appears to have this strange black bendy lines on the body, other than that he seems very healthy,water parameters are all good has anyone any idea what it is??? Sent from my iPhone using Aquarium Advice

Every few months or so I see this strange kind of balloon object that floats around and then gets destroyed by a power head, it looks like its clear jelly balloon with brown bits of detritus in it it's about 2cm in length, as far as I now it comes out of one of the rocks in the tank blows up...

Anyone help identify this hitchiker crab think it is responsible for killing my flame angel, cleaner shrimp and starfish? He is about the size of a table tennis ball grey green dimpled shell with hairy legs?

Hi having a problem with my tank, have lost my flame angel one day ago fed him on the night he was fine eating and swimming fine got up in the morning and he was dead on the sand bed half eaten! Which I presume may not have killed him as hermits in there may have started eating once he died now...

Trying to find out if this is a good or bad critter found it near the sand bed on a piece of rock but not seen it since it is about the size of a nassiurus and same features but slightly more elongated and a different colour?

Hi we have had my tank set up for a year now and have just found this crab it is about the size of a ten pence piece dark green in colour with white patches round it's pincers, it has been hiding inside a rock anyone any ideas??? Will keep trying for a better pic but it's very nervous!!!

I have just noticed today my yellow tangs pectoral fin on one side had gone a bit red at the base of it, not sure if it is a disease or could that have happened by him crashing into something? All other fish and inhabitants are fine water tests are good Nitrates 2.5 Nitrite 0.0 Ammonia 0.0...

Found this just appeared wondering what it is? It has a feather duster looking thing at the end but is minute compared to the rest of it which is about 15mm in length, it was sticking upright until a crab knocked it over!

Had this hammer coral now for about a month the skeleton is starting to show as in the pic it does extend a bit bigger than the pic but also does shrink as well is this anything to worry about??? my tank parameters are all good the nitrate s are at 4 but everything else is perfect the lighting...

I've had my tank set up now for over six months, cycled fine, but in the last three weeks the red slime algae is starting to get out of control, have put in some exictial red slime remover hopefully will get rid short term, but am just curious as to know what is causing the problem? My tank is...

Hi, I'm fairly new to marine aquariums and this is my first post! My tank has been set up now for about three months, I've found at least one aiptasia on the glass and got rid of it, but I have hopefully attached a photo of what I was hoping was another type of anemone but I now fear it's an...