Sorry but I'm not confident enough to be able to tell you for sure what species it is.
However, for your seahorses, sake, it would have been best to do some research first, to find the needs best suited for your seahorses success.
Number one thing to be concerned about in a reef tank is stinging corals.
Number two, is the possibility of stress due to faster moving fish and fish outcompeteting the seahorse for food. Sometimes stress can cause the seahorse to just stop eating.
Another factor will the possibility of the bacteria in the reef overcoming the seahorse natural immune system.
Some starting reading from my site can be found
HERE
As for the CIRI attached to the seahorse, they may disappear in time when kept in an aquarium.