My sister's saltwater tank needs to be replaced. Apparently,the cornertank she's got now is in big trouble... it's beginning to leak all over. The tank is less than a year old, I've never heard of such a problem. Is it possible that some tanks simply cannot handle salt water as opposed to fresh? Nonetheless, she's on a mission to replace the tank. Is there anything to look for to avoid this again? Should the tank be made a certain way to house salt water?