Can I add anything (hydrogen peroxide?) to stagnant rainwater to make it usable?

Velodog2

Chumono
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Many / most goldfish won't touch mosquito larvae. You may get lucky, but probably not. I have tried all kinds of fish to eat mosquito larvae and the only true guarantee is mosquito fish. I have never had a single mosquito fish that didn't LOVE eating mosquitoes. But guppies, swordtails, mollies, bettas, tetras... most won't touch 'em.

Not to beat a horse that’s already prolly dead, but this discussion had me doubting something I’d relied upon working for over a decade.

This spring has been so busy I hadn’t time to get the goldfish until today. There are now so many larvae in my rainwater tanks that they clog the holes on the rosette of my watering can. So I put three feeder goldfish ($1.69 from Petco. Would have bought more but that’s all they had) in each tub and carefully watched. Within a couple of minutes they were all actively attacking and eating the larvae. There are so many larvae it will take a while for these little fish to get the upper hand, but they will win eventually. I don’t really understand how we could have such different experiences, but I’m good as long as it works for me.
 

sparklemotion

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There are now so many larvae in my rainwater tanks that they clog the holes on the rosette of my watering can.

gag.gif
 

Velodog2

Chumono
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Perrrrrfect!

And then when they are all stuck halfway out of the holes I run my hand across it slicing them all in half ...
 
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