Looking at what the best material would be for sliding from doors. For the track (metal or plastic) and the door itself( Glass or plexiglass ) for a 3 ft long 18 inch high tank. Not something I've dealt with before so having issues figuring out what to get and where to get it. Help would be appreciated! Also side question, where can you buy melamine paint??? I wanna touch up the cut edges on my tank I'm building