Calculating PPM for Velvet treatment

[Bryan Thompson]

OK need some help here. I am trying to help someone that has a tank that is packed with marine velvet. We have let the thing sit for weeks with almost no fish in it after a mass die off from velvet. All remaining fish were healthy with no signs of disease. We introduced 2 new fish and in 4 days they were covered in white file had dark red gills and then died.

I have read this article:

http://www.reefkeeping.com/issues/2004-07/sp/feature/index.php

This tank has 2 sharks in it. Don't bash the shark thing. Not my tank and it is over 500gal with curved corners. There is a horn shark and a cat shark.

Here is my plan. 1st remove the sharks to another holding tank. I want to use the peroxide treatment as described in the link above. My question is if I have a 10% solution of peroxide how much do I add to get 25ppm in a 500gal tank?

Thank you,

Bryan

 

[steve-s]

Use Cupramine at 0.3-0.4 ppm. They will tolerate it and will eliminate the parasite without any guesswork or potentially crashing the pH with the peroxide solution. Be sure to use a properly corresponding test kit. Seachem or Salifert usually.

Watch them carefully for signs of problems but I seriously doubt you'll see any. Make sure the display system is fallowed for no less than 8 weeks.

 

[Rondelet]

Not sure why H2O2 would crash the pH?

Anyway, to answer your question, use the following formula:

C1V1 = C2V2

Where:
C1 = concentration of your H202. 10% = 100,000 mg/L
V1 = the volume you're looking for, in L
C2 = the target does 25 ppm, or 25 mg/L
V2 = the volume of the tank to be treated 500 gal = 2,273 L.

So…(now you probably wish you had listened in algebra class….)

100,000 mg/L x "X"L = 25 mg/L x 2,273 L
"X" L= 0.561, or

561 mL.

Do heed the warning by the author of the article you've cited about the experimental nature of this treatment in mind. Having said that, for the benefits of those reading this thread (myself included) do post your findings!

Hope this helps.

 

[NanoLurker]

i have used hydrogen peroxide dips on fish (300 pppm for 10 to 15 minutes). i used noga's dosages, just be careful that he states some fish do not tolerate this well, i was treating for uronema on seahorses and they tolerated the treatment. are you going planning on leaving the sharks in the tank during treatment?

 

[steve-s]

<a href=showthread.php?s=&postid=9179229#post9179229 target=_blank>Originally posted</a> by Rondelet
Not sure why H2O2 would crash the pH?

H2O2 can/will cause a marked increase in O2 saturation. If that saturation gets too high, the pH will crash. Being one of the stronger oxidizing agents, H2O2 becomes O2 and acid once added to SW.

 

[Bryan Thompson]

Thank you for the help and comments. I do plan to treat the tank with the sharks in it. I will keep everyone posted.

Bryan

 

[Bryan Thompson]

Here is the update. We shut down all the pumps and treated the tank with fish, sharks, coral and anemones all in the tank. We did a treatment of 25ppm for 30 minutes. We then started the pumps and did a 10% water change.

We repeated the treatment 2 days later with no water change this time.

We lost 1 fish, shoal tang that was in real bad shape when we started. We now have no signs of the disease. All the fish and the sharks are breathing slower and normal now.

We are adding fish tonight and I will give you an update in a few days.

Bryan