"I have a 3 gal lided/floresent lighted acrylic tank w/ 5" of EcoEarth. The directions state to apply UTH to the side of tank for acrylic tanks (NEVER under) toward bottom of tank wall. Works like a charm. Salt water moistened EE w/ heater (enough EE is in tank to cover heater on side wall) keeps 3 gal tank at low 70's temp w/o light to high 70's low 80's w/ light and 70-80% humidity. Hermies love to tunnel and play in deep EE and have temp varience from front to back of tank w/ UTH on back wall."