Am fighting a persnickety algal outbreak and am about to resort to peroxide... but wanted to see if anyone had noticed negative effects on fishes, and if so, are there any groups of fishes that are particularly sensitive to it?
peroxide sensitivity
Started by
Guest_daveneely_*
, Nov 23 2013 01:20 PM
9 replies to this topic
#2
Guest_Erica Lyons_*
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Posted 23 November 2013 - 05:12 PM
I have never had to resort to peroxide. Algae won't grow if you break up the light cycle. I use 100 to 200 lumens per gallon for 3 hours before work and 5 hours when I get home from work and there is no algae growth. Do you have live plants in this tank? What's the nitrate concentration in ppm?
You shouldn't have to use something that might hurt your fish to try to control your algae. There are other ways.
You shouldn't have to use something that might hurt your fish to try to control your algae. There are other ways.
#3
Guest_jblaylock_*
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Posted 23 November 2013 - 10:09 PM
Am fighting a persnickety algal outbreak and am about to resort to peroxide... but wanted to see if anyone had noticed negative effects on fishes, and if so, are there any groups of fishes that are particularly sensitive to it?
I started using it to clean my 3d background. Shortly after I started having a lot of problems with disease on shiners. I can't say 100% that it was due to using peroxide or not. Near this time I had introduced some new fish too, so the problem could have came with them.
From what I read on it, it seems that peroxide shouldn't hurt fish....but that's debatable. So really, I've not been much help. I will say that I stopped using it on a regular basis.
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#4
Guest_rickwrench_*
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Posted 01 December 2013 - 06:45 PM
Individual species info is available, but lots of it is behind paywalls.
Anecdotal evidence says most fish with scales tolerate h2o2 better then those with plates and skin.
Walleyes are apparently not "most" fish, and are sensitive to h2o2 (http://www.researchg...erling_Walleyes)
LD50s for daphnia and fatheads here:
http://fish.bakerweb.biz/peroxide.html
Studies for aquaculture:
http://edis.ifas.ufl.edu/fa157
What else is in the tank(s)? Plants, substrate, filter, etc...
Rick
Anecdotal evidence says most fish with scales tolerate h2o2 better then those with plates and skin.
Walleyes are apparently not "most" fish, and are sensitive to h2o2 (http://www.researchg...erling_Walleyes)
LD50s for daphnia and fatheads here:
http://fish.bakerweb.biz/peroxide.html
Studies for aquaculture:
http://edis.ifas.ufl.edu/fa157
What else is in the tank(s)? Plants, substrate, filter, etc...
Rick
#5
Guest_daveneely_*
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Posted 01 December 2013 - 09:56 PM
Thanks Rick, that was just what I was looking for...
The good news is that all of the fish (some darters and madtoms) did just fine at ~1mL H2O2/L, and it knocked back the algae in spectacular fashion. I'd heard the 'non-scaled' bit before and was a little worried about the cats, but they don't appear to have suffered any ill effects.
The bad news is that as I'd already dialed back light intensity to try to deal with the algae, and that last cold spell dropped my house temp somewhat, my plants (a fine-leaved Potamogeton and an interesting little Ludwigia that I never got around to keying out) had started to senesce and got toasted. Maybe they'll survive as rootstock until the spring...
The good news is that all of the fish (some darters and madtoms) did just fine at ~1mL H2O2/L, and it knocked back the algae in spectacular fashion. I'd heard the 'non-scaled' bit before and was a little worried about the cats, but they don't appear to have suffered any ill effects.
The bad news is that as I'd already dialed back light intensity to try to deal with the algae, and that last cold spell dropped my house temp somewhat, my plants (a fine-leaved Potamogeton and an interesting little Ludwigia that I never got around to keying out) had started to senesce and got toasted. Maybe they'll survive as rootstock until the spring...
#6
Guest_Erica Lyons_*
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Posted 02 December 2013 - 12:00 AM
How many lumens of light do you have over the aquarium and how many gallons is it? How many hours a day are the lights on?
#7
Guest_gerald_*
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Posted 02 December 2013 - 10:20 AM
When nativeplanter was around here she often recommended adding 1 oz of 3% peroxide per 10 gal for killing algae, which is about 0.7 ml/Liter, pretty close to what you used. I think she said you could repeat that dose every other day if needed. Mix it into a quart of water first, so the fish dont get a facefull of concentrate (they're probably expecting food), and add it when lights are off, since light degrades peroxide.
#8
Guest_Orangespotted_*
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Posted 02 December 2013 - 11:51 AM
It might be more efficient to take a turkey baster or medicine syringe to squirt it right on the problem spots. Works for me, and doesn't harm other plants in the tank which are sensitive (hornwort, najas, elodea).
#9
Guest_daveneely_*
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Posted 02 December 2013 - 01:48 PM
It might be more efficient to take a turkey baster or medicine syringe to squirt it right on the problem spots. Works for me, and doesn't harm other plants in the tank which are sensitive (hornwort, najas, elodea).
Yeah, the problem is the darters are used to being fed by pipette, so they swim up expecting food. I'll keep the lights-off trick in mind for next time if it comes to that. Sneaky...
Fish are alive, algae is knocked back, and plants are either alive or dead. If they don't come back in the spring, there's plenty more where they came from. Worse things could have happened.
#10
PBK
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Posted 06 July 2020 - 04:40 PM
Use peroxide carefully. Scaleless fish or fish with sensitive gills might suffer oxygen burns.
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