Hello. In the next 3 weeks to a month i am going to get a Tiger Pistol Shrimp and Yellow Watchman Goby. My question is that I have the Special Grade Arag-Alive! Reef Sand and was wondering if the Shrimp will be able to makes caves in this sand? i have a 1' sand bed now but have more sand ordered to get it to 2-2.5". My son is really excited for the 2 to get here and i want to try to give them the best chance to be happy. Should i get some crushed up live rock for him to use in the cave or possibly make him something? Any help or ideas would be appreciated. thanks