Aquaforest Poly Glue :
Usage: Glue granules should be placed in hot water (about 60ºC/ 140ºF); after a few minutes easily forming mass will create, which has the best adhesive properties. The adhesive will become completely solid when placed in the aquarium. We recommend that gluing process is performed out of the water. Coral can be placed in the water 30 seconds after bonding. Unused mass can be used again. Biodegradable product.