Had a good sized watermelon bubble tip that was always out looked awesome. Along with 6-7 other nems witch are all still doing fine but the big guy split twice and for over a month all 3 sections looked good and moved to there own spot and looked good. Shortly after adding a cpl porcelain crabs all 3 sections started to withdraw. For a cpl weeks now they move a little but look rough. 1 looks like it’s starting to extend out in more of a normal fashion but the other 2 not so much. No issues with other nems, fish, shrimp, corals. torch, frogspawn and hammer are all good as well. Any thoughts ?