Blind Foxface?

[Gizmo]

Hey, I noticed today when my photocycle started, that my foxface seems to be absolutly blind, he swims around running into things. This is a new development. Nothing has changed and my water param's are within norm. Is this something normal for the foxface? I tried to "scare" him by moving my hands in front of the glass, which usually gets him spiky, but I dont get a reaction.