saltwater aquarium help

I thought it was coraline. The spots haven't grown or disappeared. Only more showed up. It's hard to get a better picture than this. They are literally like white peices of sand on the back of my tank. Thats it.

I have a 55 gal tank that has been running for close to two years. My LTA was added maybe about a month and a half ago. He was eating very well and hosting one of my Domino Damsels. Suddenly he curled up and started excreting a lot of waste. He would open up for small intervals of time randomly...

Pardon the unfamiliarity, my grandma gifted me some smallish (2-3 inch) pismo clams that she had bred in her tank, in hopes that I could raise a few of them on my own. She recommended quite a bit of heavy duty lighting equipment, but I'm tight on money and was wondering if there is a way I can...

Pardon the unfamiliarity, my grandma gifted me some smallish (2-3 inch) pismo clams that she had bred in her tank, in hopes that I could raise a few of them on my own. She recommended quite a bit of heavy duty lighting equipment, but I'm tight on money and was wondering if there is a way I can...

Please help, i have a hugh ammonia problem and dont know what to do. Starting from the beginning, i have run the tank for 6 months with no issues, but about two weeks ago i stupidly stirred up the sand bed after 6 months on it being untouched with a vacuum (first mistake) for the week after...