If you're really worried about the meds, then the method emc7 mentioned can work for you. get a bunch of small containers, like plastic ones, about 3 or 4 if them. Set them up with water and an airstone or small filter, and move the fish onto one of them. The next day, move the fish into the next one, and dump the first one. Reset up the first one, and the next day, move the fish to the third one. dump & refill #2, and the next day, Move the fish to #4. The next day, put them back into the first one and start over; I think by now you see the pattern. After a couple weeks of this rotation, the ickies will have all fallen off the fish, which would have always been long-gone by the time the swarmers hatched. You'll have spotlessly clean fish untainted by meds, and if you cleaned up your main tank during this time, they'll have a clean tank waiting for their return.
If that sounds like too much work, then just separate all the inverts from the plants and the loaches and tetras, etc... into different containers and treat them all separately according to their tolerances.
If that's also too much work then crank up the heat to 95 while simultaneously increasing the aeration circulation by a great amount to compensate for the lost oxygen. ( hot water holds less oxygen, while at the same time hot fish NEED more oxygen )
A few hours at 94 will wipe out most ich, you see. Then you can lower the temp slowly over the next week. This isn't a recommended method by any means, but I mention it for the sake of completeness.
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