Help Identify this disease for proper treatment

[Curt2199]

The tank is a 700g (850 with sump). I just started treating crypto with Chloroquine Phosphate yesterday after having lost some prized fish (18" stars and stripe and Achilles tang). The fish are active, actually moreso with even only 12 hours on treatment) however a few seem to have secondary infections and I'm wondering if Melafix is the next med that needs to go in. I have a small niger trigger with what I'm sure is pop eye but my Atlantic Blue has something different that appears to be blotches that are brown in color. My first thought was black ich but I've treated that with prazi before and it was much more black in color.

My large vlamingi has also stopped eating but is out of hiding finally after 12 hours on Chloroquine when he's been hiding for a couple days. He definitely has some sliming and cloudy eye

I'm attaching some pics of the Atlantic Blue as that's the only one in question. The guy is tough as he's looked very bad and ragged but he's hanging on!

 

[GroktheCube]

How did you dose the chloroquine?

If it's velvet, my understanding is that the chloroquine should kill all of it living on the fish after ~48 hours.

Hopefully someone with keen eyes and more experience can help you ID the disease. When I see that sort of cloudy slime on the fish, I'd tend to assume brook or velvet.

EDIT: Also, if you're using chloroquine, you should turn off any light in the low blue-violet range. Most of them produce at least some UV, which will deactivate chloroquine quickly.

 

[Curt2199]

I mixed the powder with tank water and dumped it in gradually. I dosed 30 grams for an estimated 750 gallon volume accounting for rock.

My lights aren't very strong on the tank but I will cut out all blues and uv and turn the whole light down. I believe the whites are on a separate channel. I also have the skimmer off.

Also it could be velvet as I'm seeing white shading on fish but I do clearly see crypto cysts on some fish. The Atlantic blue tang has brown patches which don't fall under crypto or velvet so I'm assuming something bacterial or black ich.

 

[Deinonych]

EDIT: Also, if you're using chloroquine, you should turn off any light in the low blue-violet range. Most of them produce at least some UV, which will deactivate chloroquine quickly.

I would turn off all lights while treating. Without a spectrophotometer, it's impossible to tell how quickly CP is being denatured by light. Ambient room lighting is fine.

 

[MrTuskfish]

I would turn off all lights while treating. Without a spectrophotometer, it's impossible to tell how quickly CP is being denatured by light. Ambient room lighting is fine.

Very important. The more I learn about CP, the more I realize how keeping lights down is vital; CP is very light-sensetive.