<a href=showthread.php?s=&postid=15563477#post15563477 target=_blank>Originally posted</a> by Elysia
Is that a Trachyphyllia in the first photo? (with its feeding tentacles around the body of the one male reidi?) Open brain corals are not a good tankmate for small seahorses, IMO. From Dr. Shimek "These are voracious feeders that are often adept at capturing small fishes." Borneman says virtually the same thing.
As has already been mentioned, a nine gallon tank is MUCH too small for two reidi seahorses. Seahorses need to feed often, and as such put a lot of pressure on the water quality. Nine gallons would not be an appropriate amount of space for even one of these horses.
The hazard posed by the incompatible tankmates is made even more dangerous by the fact that the tank is so small that the seahorses and the coral, shrimp, and clam do not have the opportunity to get away from one another. Clams are known to snap down on curious fish faces and seahorses are notorious for sticking their tails where they don't belong (because most are not very strong swimmers.)
Finally, it is much better for the seahorses if they are kept in a tank maintained at a temperture of 74 degrees or below.
I'm sorry to be such a downer, but your seahorses are beautiful and I'm sure we all want what is best for these interesting creatures. If you are unable to house these horses in a more appropriate set up, IMO it would be best for the seahorses if you did sell them to someone who can properly care for them.