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Just an update for everyone in case this happens to you. The mystery coral eater is 100% my long spine urchin. I’ve now witnessed it in the act of eating two different coral (a gorgonian and a monti cap). Let this be a cautionary tale if you’re considering one yourself!

Just curious, Why do you suspect them? Personal experience? Do either have mouths capable of chewing stony coral?

Thanks, Chris. I will try keeping an eye out when the lights go off.

Thanks, Tim!

Hi All, This morning I woke up to a disturbing site. A few tips on my bonsai acro appeared as if they had been gnawed on... there was clearly erosion in the skeleton, the polyps at the very end of the tips were gone, and those areas were producing mucus like crazy. Similarly, A few weeks ago...

They do mariculture corals in order to seed the reefs. I don't know about the Great Barrier Reef, but in Key Largo the Coral Restoration program does exactly this, but scaling up that kind of effort to replace what is lost is an incredible undertaking. Imagine trying to seed hundreds of square...

If you figure it out, please post! I ended up tossing the colony since I had a healthy frag of it, but that healthy frag was located lower in the aquarium so it could have been because of light. The frag is now placed where the diseased colony was so if it happens again, I’ll know it could be...

Thanks for the advice, Frank. I hadn’t thought about flow, but the neighboring colonies with presumably the same flow are doing fine. I finally decided to just toss out the colony since I had a healthy frag of it. Placed the frag in the exact same spot so if this happens again, I’ll tinker...

Thanks, Chris. Got me stumped too! I

nope, nothing like that

The polyps don't discolor, but if by "melt" you mean they continuously shrink until they're practically nothing, then yes some do that. At least a couple have just fallen off the rock. I feed all the zooanthids occasionally (maybe once a week, with a product called Coral Smoothie), but again...

Hi Chris, I've never seen any of my current fish nipping at them. I have 2 Bangaii cardinals, 2 ocellaris clowns, 1 firefish, 1 mandarin and a six line wrasse. I know six lines can get a little 'nippy' but I've only had it for a month and the problem predates the wrasse. It's also odd no one...

Hey Everyone, For the last couple of months or so, my colony of pink ray zooanthids are not looking so great. I've had the colony for 7 months and for the first few months they appeared healthy and full with all polyps open. Lately (the last 2-3 months), many of the polyps throughout the...

Hi Spooky. That's an interesting thought! But no, I don't have any big predators in my tank. Honestly, I'd probably feel bad for the little guys using most of them as food.

Thanks, Dz6t. That makes perfect sense - I kind of got that feeling which is why I wanted to ask folks on the forum. Do you think there is a fish species worth breeding at home? I also thought about H. erectus seahorses, but I imagine there are fewer people interested in seahorses than clowns.

Thanks, Chris. (I also did a double take about the bi curious autocorrect, lol!) That's sort of what I was assuming, that it might be difficult to unload the babies. I'll also talk to my local fish store and see what they have to say.

Hi Everyone, My name is Matt Sullivan, and I'm new to the forum and relatively new to the hobby. Although I had freshwater aquariums growing up and in college, I started my first reef tank a little less than a year ago. I'm definitely loving the hobby and as a scientist by training (M.S. in...