i have never done a saltwater tank before and i want to do a fish only, i bought some decorative rock like geodes and what appear to mimmick coral the LFS said all will be safe in salt water, i plan on filing down the rock and then using silicone to attatch them together all will be done after i rinse them as per the LFS advice on rinsing, is this a viable method for acheiving a rock wall effect? I GREATLY APPRECIATE THE INPUT and i will have many more questions THANK YOU