Milky streaks on Glass Catfish
First things first, I've had 5 in a 20g long for about 5 months now, only 1 is full size.
I understand the recommended tank is 25g for these guys, but it hasn't been a problem with tons of plants, 2 caves they stay in, plus an open feeding area.
Filters are Eheim Liberty (30g) plus an aquaclear 10.
Tank went through Ich treatment, (Very little salt) but got the temp up for 2 weeks. All was fine, ich dissipated, another 2 months went by.
Then during feeding yesterday, I noticed the largest catfish had milky streaks/patches down his one side. Not visible on the side he usually has facing the glass (Because of the current)
I can't find much info other than "it is stressed or dying". Can't any one throw in their 2 cents?
There's no reason for him to be stressed, although I removed neon tetras last week, plus hand removed snails just under a week ago.
Do the streak like patches indicate something other than stress? Are blotches more common than streaks, and indicate something else?
It still acts 100% normal. First time dealing with health issues on one of my more sensitive fish.