Wow so after years I found this 8ft coffin in my basement with a viewing window; I am starting this build back up and I will be using liquid rubber to coat the inside of the tank to seal it; skipping the fiberglass. It dawned on me 8ft long!! starting to wonder about bowing issues. Thank tank is low though only 19" tall I think I will be okay. Pic's soon & and it feels good to get back into this. Oh BTW on the top there will be almost 5, 5" wide braces. Def trying to Rez a dead thread!!! this box will not turn into a flower planter!