Thanks for all your replies.
I believe they are called black kudas. (By the way, Kuda in Malay means horse.. hmm..)..not sure of the scientific name.
They are eating brines and frozen fresh cylopees.
I have lots of mysis shrimp and various pods species in the seahorse tank, sump and overflow. During the night it's about 30 of them swimming like crazy at the bottom of the seahorse tank and hunt for brines in the water.
I have a self-feed brine hatcher installed at the back of the tank to feed it..
I also have banded pipes and a small multi-colored with blue stripes pipefish. I will try to catch some pics when they come out to feed But normally they would be out after lights out.
I also started feeding rotifers and home made phytos. DT is just way too expensive...
I actually set my digital camera to 'burst 3' exposure to snap 3 at the same time. The camera would then select the best exposure with the aperture and shutter. I then pick the best picture and delete the rest of the two. This way I am certain that I don't loose a good angle when a fish/critter passes by.