05-21-2013, 11:22 AM
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Hmm. From what I'm reading in my fish disease books, it looks like the recommended treatment for childonella and related parasites is formalin (formaldehyde). Next best choice is copper. As you already know, neither of those is suitable for plants and inverts. Regrettably, it seems like no treatment is safe for plants and inverts and most treatments are going too harsh for the cories and the plecos. It seems like your possible best solution would be a 1 minute salt dip (half a tsp per gallon) for the most sensitive species (ie, the cories and plecos) and either a formalin or copper dip for the other fish. Using dips/baths is probably the only way you'll be able to treat them all without losing the plants and inverts.
Make up the medication at the recommended dosage and then dip each fish in a net for 1 minute, up to 10 minutes if they show no signs of distress (being in a net notwithstanding). Repeat the baths at least once daily for two weeks. If you can, raise the temp in the tank to 86 F to speed up the life cycle of the parasites.
Alternatively, if you have a pair of hospital tanks, you could isolate the plecos, cories, and inverts in one and treat with the salt baths outside the tank and treat the other less sensitive fish with formalin or copper in the other tank as a round-the-clock immersion per package directions. While the fish are out of the tank, raise the heat in the tank to 86 F. Without hosts and because of the high heat, any remaining parasites in the tank should die off quite rapidly.
Whoops, sorry for the wordy post! But I hope this helps you. Good luck!