I think it might be better to move the inverts into a 10gal [or both the 10 and 5], rather than moving the fish, because you have too many fish to cram into a 10 and 5 gal. You will need to also move some of your gravel into the smaller tanks for your inverts, and will need to provide lighting for your anemones. Its a difficult call, as moving any animal is a stressful event. Use water from your existing tank [as long as that water has not been medicated] to seed your smaller temporary tanks. Watch water quality closely to ensure well-being of inverts and be prepared to do water changes. Marke sure that the temp and PH is exactly what is in your main tank. Inverts are extremely sensitive to changes.
Hpyosalinity: Over the course of the next 2 days, drop your salinity in your fishes' tank down to 1.009. Continue to feed the fish garlic soaked food. Hyposalinity will have to continue for 3 weeks AFTER all signs of ick are gone. Once the ick is gone, and you have waited the 3 weeks, then you can raise the salinity back to normal levels, over the course of a week. If all is well, then return your tank to normal conditions by returning the inverts home.
There are many topics here on hyposalinity if you will use the search feature here on the BB. You can read while you begin the process. [Don't forget to feed your inverts!]
Good luck!
[ August 14, 2001: Message edited by: Beth ]