Treating Velvet?

[Rondelet]

As a rule, higher doses are better - provided your fish can tolerate it. If you're confident with your volume/dose calculation I would go with the higher dose - although I must admit I don't know what the therapeutic margin of chloroquine sulphate is. My guess is that it is reasonable (i.e., better than copper) but depends on the species of fish water chemistry specifics.

[Aquattro]

It sounds like people dose the initial amount, then retreat without water changes, resulting, in my mind, a cumulative dosage much higher than suggested. I did read though, a couple of note on fish mortality blamed on too high of a dose. So, not sure. Bob Goemans in one article suggested 20mg/l, although most references say 10mg/l as a single treatment for 10 days.
I'll try your suggested method of a single dose, then a water change 5 days later with an adjusted dose.

[hillegom]

I read in one of the articles last night that light degrades the CP. So it might not be a cumulative dose.
If you only dose the one time for 10 days maybe just keep the lights low or only on for a short time.

[Aquattro]

I've just got a small light on the tank, and will dose again in 5 days.

[Rondelet]

So how did you make out? Any updates?

[Aquattro]

Originally Posted by Rondelet

So how did you make out? Any updates?

Probably got the med in too late, lost a few more fish. I've got 8 fish in the treatment now. We'll see how the next few days goes. I ordered some CP today from the US, I'll use that to treat the new fish when that day comes.

[daniella3d]

Where did you buy it from?

Originally Posted by Aquattro

Probably got the med in too late, lost a few more fish. I've got 8 fish in the treatment now. We'll see how the next few days goes. I ordered some CP today from the US, I'll use that to treat the new fish when that day comes.