Rodney wrote:

My tank has a recurring ich problem. How do I clean the tank
thoroughly? I've been doing frequent water changes and adding
medication when the ich problem occurs, but the outbreaks seem to get
worse after each water change.

You might consider tub-to-tub ing your fish...
http://users.megapathdsl.net/~solo/p...htm#TUB_TO_TUB

0) remove fish (duh)
1) bleach tank
2) rinse tank with water and dechlorinator until you can't smell bleach.
(lots of times)
2a) Might want to leave it out in direct sunshine a couple of days...
3) restart (recycle, ugh, consider fishless cycling)

Keep in mind that your media could be contaminated too. Read up on the
ich lifecycle. You might be able to wait it out without hosts for
them...

-D
--
"There is nothing so strong as gentleness, and there is nothing so
gentle as real strength." St. Francis de Sales