Looking for advice on the placement of my heat exchange coils in my tank. The dealer I bought my Innova from gave me an exchanger that he took out when he converted someone to pellets (much appreciated). The coils are about 36" high and my tank is 56" high. I've at least one post where it was suggested to support the coils with concrete block wrapping in poly. I was thinking regular bricks actually but I'm not sure if they will be too low. I want to protect the EPDM liner. Thanks!