L lightsout Plecostomus Original poster MFK Member Apr 9, 2015 254 161 51 Amazon Gender Male Mar 25, 2019 #1 Any idea what this is? I noticed this happen in the other carps as well but it usually went away after a few days and never this bad. Earlier today I noticed red build up on the bottom of the eye now it completely all red. Right eye is fine. The left eye looks bad.