I’m not sure how much rock you have for him to hide in. A brittle star, even a large green brittle would not consume an entire fox face unless he was tiny. I would assume he is either hiding, or if open topped tank, maybe jumped. Depending on age of tank, watch ammonia and/or nitrates. One or both may spike if he died and is deteriorating in the tank. Much smaller tank than mine, but I have fish, even larger ones that go MIA for a couple days.
Tank is 7 months, 40 gal, open top, and no fish noted outside of the tank. They are the hairy BS’s. I do have a lot of rock, and I’m hoping that it is just hiding. Tried to see if he would come out for a feeding, but nothing. It was about 2”, my ammonia and nitrates are good
Yes , hopefully, I do have many hiding areas, large rock formations. I know they are very shy.While not invisible if you're really looking, my Foxface has some impressive camouflage when he wants to hide. Typically it's just under a Sinularia coral and quite obvious but if he's in a cave he's quite difficult to make out.
Just keep an eye on it. I have had fish that hid long enough that when they came out, I had forgotten about them. Kinda like Christmas whenever.
They are excellent hiders and also jumpers as mentioned by Peaceriver. Also check overflow box to see if it got in there. One thing you can try if hiding well is to set your phone on video mode for 30 mins and drop a little food and walk away. YOU MUST walk away.
You'd know if they jumped and you'd know if they were dinner. If you haven't observed any fish remains or nitrate increases, I'd say its hidden.
