i built a masonry pond in my basement. the inside messurments are 10 feet long by 5 feet wide and almost 5 feet tall. i built a huge window in the front. my brother and i got someone to do the sealing and glass work for us. unfortunately after he sealed the tank and put in the 1 and 1 half inch thick plexi it leaked. the guy hasn't answered his phone since. so we have to take matters into our own hands. we are trying to find a product to seal the whole tank with. it already has a coating of soming called CIM. i don't know what that stands for. any help would be great. my 3 foot long snakeheads need a bigger home as soon as possible.
