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Do you have another picture of the shrimp from the side, could always be a camleback shrimp that is not reef safe and could be eating your coral, or as described above it could just be cleaning it.
Agreed with others do a bit at a time, and if you have a pvc tube that reaches the bottom of you tank, pour it down that to keep the sandstorm to a minimum
We have done it two ways. One with just some pods on a widow sill in a vase. Swap some water between the tank every few days with the tigger pods and this culture can go for a while. Eventually it does crash, but you can get a long time for one bottle of pods. We also now are running the air...
A couple of quick thoughts: Salt need I think depends on if you are supplementing your water change with anything else. If you are using a calcium reactor or dosing pumps I don't' think you need any special salt. However, if you are just using water changes, yeah maybe you want to look at...