I beleive your heater problems have been answered. But as for your ich
problems, I would be carefull with too much salt with catfish. Also I
cannot stress the importance of good water quality, you may have to do
daily 20% water changes (with proper conditioners). Good bio filtration
is a must, but this takes time. Seeding your tank with aged gravel from
a friend or an aged sponge filter (they work great) can also help. I
have used "medicated wonder shells' for years on my aquarium
maintenance route with excellent results (they also help with cloudy
water, but do not replace good water quality management). You can
obtain them at
http://americanaquariumproducts.com/...mProducts.html
Carl