NO sealant on hose connections to tank fittings. All sanitation hose connections and any others connected to below waterline fittings should be double clamped, with screws 180 degrees apart...or at least 90 degrees if access makes 180 impossible.
Tank fittings should be threaded into the tank...the threads wrapped in plenty of Teflon tape. No other sealant or gasket needed.
Btw, warming hoses (WARMING, not heating!) makes it a lot easier to remove from fittings and also to put onto fittings. Lubricate with a little dishwashing liquid (Dawn etc) or better yet, K-Y jelly which is a water soluble surgical jelly that dries out so doesn't leave you with a permanently slippery connection.
--Peggie