I just lost the bicolor blenny. All were breathing extremely heavy. Params are fine and fish looked fine last night
how do you check with a multimeter?
I would get a grounding probe (which plugs into the ground pin of a wall outlet), put the black (ground/negative) lead of the multimeter on that, then put the metal part of the red lead into the water. Can check both DC and AC voltage to see if there is any stray voltage in the water (should be close to 0 if everything is ok). Not sure what it would read if things (heater, pump, etc) were bad/leaky, but it would be significantly higher than 0.
If you get something, you can unplug things one-by-one till the reading goes to zero. The last thing you unplugged may be the culprit.
(Disclaimer: people should know multimeter basics before using one around electricity)
Disclaimer: I'm no chemist, but I did stay at a Holiday Inn Express last night...
Ok, so the article says we need 75ppm (with a maximum of 150ppm, but lets shoot for 75) of H2O2 (hydrogen peroxide).
I'll do the calculations for a single gallon, that way you can scale up to whatever container or tank you are using.
1 gallon = 128 fl. oz.
75ppm is equal to 0.000075 (just take 75 and divide it by 1 million)
Multiplying we get 128fl.oz. X 0.000075 = 0.0096 fl. oz. of pure H2O2 needed per gallon.
Now a typical brown bottle of H2O2 solution from the store is 3%. That means for every fluid ounce in the brown bottle, you get 0.03 fl. oz. of pure H2O2.
With me so far?
If we need 0.0096 fl. oz. of pure, and we get 0.03 fl. oz. pure from each ounce out of the brown bottle, then we only need about 1/3 of an ounce from the brown bottle of H2O2 per gallon of saltwater.
(0.0096 / 0.03 = 0.32 or about one-third)
Since 1 standard teaspoon holds about one-sixth of an ounce, and we need one-third of an ounce, then we need to use 2 standard teaspoons out of the brown bottle of hydrogen peroxide per 1 gallon of saltwater to make approximately 75ppm.
(0.32 / 0.1667 = 1.9196 teaspoons)
So if you are using a bucket with four gallons of saltwater (in a 5 gallon bucket) to dip your fish, you would need 8 teaspoons of H2O2 from the brown bottle of standard 3% hydrogen peroxide from the drugstore or walmart (4 gallons at 2 teaspoons per gallon). Probably the best way to go.
The article suggests a 30 minute dip.
Now having said all of that, you can do this at your own risk. I don't take any responsibility for fish loss of life or anything else. I also would not spill hydrogen peroxide on yourself or anything else and be sure to make a new dip solution every day you treat the fish. Hydrogen peroxide can loose potency when exposed to air, so keep the cap on the bottle, and make your dip solution fresh right before you are ready to use it. Don't use any metal containers or spoons with your hydrogen peroxide solution, as it is mildly corrosive (and you don't want to expose your fish to metal anyway).