I've successfully kept an ENF, Fidget, for about 8 months now. He was healthy and happy and still is other than there is a thin film of white slime now covering his face and a little bit of his back. I just did a water change, and before and after the change the water parameters are 100% fine. I dont take my fish out of the tank, and I pretreat my water with simply aloe based water conditioner/dechlorinator before filling my tank. Currently he is chilling in his cave, or I would take a picture. He even eats blood worms from my hand. I'm not exactly sure what to do, or if its just stress from the stirred up crap and the water change, or a normal thing they go through. ALSO I am going on vacation soon, and i am unsure what to do about feeding him while i'm gone, is there a specific vacation feeder I can give him? He does sometimes eat flakes from the top of the tank and actually enjoys it. I dont have anyone to come and feed him while i'm gone either. So that is out of the question . I forgot to mention. His tank mates are 2 nerite snails, 3 otto cats, 4 neon tetras, 1 24-carat cloud tetra, 1 high fin Chinese banded sucker/shark, and a mated pair of angels that i randomly got from Petco by chance. They are in a 46 Gallon bow tank. And as stated above, water parameters are 100% fine, and its also a planted tank.