TLF - STAXSTAX is flat, porous oolitic limestone for building layered aquascapes in marine or freshwater aquariums. Provides a stable structure and limitless creative fun! Avoid introducing pests and create the aquascape of your dreams. Use with STIX cement to make open, gravity defying structures with lots of horizontal surfaces for attaching live corals. Use AquaStik or CorAffix with STAX to create a base for coral frags.