Clear on a tank without black trim for sure, I've also done black before but I just prefer clear. If you do it right and minimize the bead there really isn't much to get dirty and the actual seams look better IMO.
Plus I'm looking at mine right now and the silicone looks new in and out, tanks been in use for about 2 years give or take, never once have I cleaned the silicone. Come to think of it I recall my previous cube, I had one spot on the back I didn't bother cleaning up very well when I siliconed it cause I figured algae would soon cover it up, it never did and it really bothered me.
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