What is this on my Lobo

[juniordjl]

I have a RSM130 with 3 Ecoxotic Pro Modules(2 12k White/445nm blue, and 1 445nm blue. My Aussie Lobo is in the Sand bed and eats Mysis shrimp regularly and has been in my tank for 7 months with absolutely no issues. I looked in the tank last night when the lights were timing down so that just the blues were on, and found what looked like a rip from its mouth to the edge of the outer ring with what looks like white stringy balled up strands, almost like a ball of intestines. I have not introduced anything new into the tank in several weeks. I am running a proflex Model 1 refugium/sump instead of the built in sump on the RSM. it has a growing ball of Cheato. The first pic is from the last night the second pic is from the day before, is there a chance he is too close to the frogspawn. I have never seen sweeper tentacles coming from the frogspawn.
Would love any insite.

 

[kurt_n]

Those are mesenterial filaments, and you're right... they're basically a ball of intestines. Corals put them out there when they're threatened or attacking. Yes, I'd say it's too close to the frogspawn. I'd move it at least 8 inches away from it. I'm thinking once you do that it'll make both corals happier! Once you move the Lobo (which actually looks more like a Trachyphyllia to me, but it's hard to tell with it so puffy) you can move the frogspawn a little more left - it looks a little too close to that Duncan for my personal preference.

 

[juniordjl]

Thank you, I will do that. When I bought it, it was labeled as an aussie rainbow lobo, but you could be right I am still learning.