Hey ppl.. Not sure if i'm posting in the right place but thought this would be the best option.. anyways.. i'm in the process of building a pond.. rather a large tank.. above the ground.. concrete.. and a glass viewing area.. the dimensions are roughly 14' X 10' X 4'.. about 3500 gallons when 85% filled with water.. I've been planning to tile the inner surface of this tank.. any ideas on what sort of tiles i should be using? and what would be safe for the fish? .. i dont want a swimming pool blue.. would prefer black.. but again over time there would be salt build up on the tiles right.. please recommend the safest alternative for the fish and somethin that can overcome the salt build up.. and oh the tank would house my Silver Arowanas, RTC, Pacu and oscars.. Please let me know.. cheers.. 
