So I'm coming on 5 years in this hobby and like most I've dealt with it all. Or it seems like atleast. The other night I saw one of these sea spiders in my tank. I've seen these before and never really cared and this one got blown off the rock shortly before I could get it. Well last night I found one feasting on my new sps. I freaked out and grabbed the frag to get the spider off. Threw it in some Tupperware and hit the Google. Turns out they do eat corals and I have proof he was eating mine. As they digest what they are eating it gets stored in their legs. This one in particular had brown legs and there is damage on the tip of the sps he was eating from. I spent a half hour sitting on a bucket in front of my tank with a flashlight and found 4 more. Here is the most disheartening part, quoted from Dr Ronald L Shimek himself "Frankly, if they are found on corals in any tank, the best option would likely be to remove the coral from the tank, and simply dispose of it." Link to article http://reefkeeping.com/issues/2003-01/rs/ I've read a few other articles on how to get rid of them and they very in terms of hope. Assuming they haven't killed each other I have 5 to experiment on but if anyone has any ideas where to look next I'd greatly appreciate it.