Hello Dehvid
Salt or hard water buildup can be a pain to clean and look really bad, but once you use some hot water and bleach and a good scrub brush, it should come off ok as long as its a glass tank.
I use two filters on my 55 and only clean out one filter media at a time, leaving the other intact. I hardly ever need to change out the filter media, just a good rinse in a bucket of used tank water during a
water change works.
BigAls has some great prices for hood lights and I believe they are on sale right now. You should take a peek at their online store for prices.
Best of luck with your new tank!
