Bad news update - ALL baby seahorse died. Don't know why - bought a new pico tank with back filter/pump. Pump is too strong so decided not to use it, only airstone and heater in the back chamber. Did hatch some live Baby Brine shrimp/mix it with Phytoplankton and move everything in the new tank.
The seahorse look ok in the new tank, was swimming but not eating much. Light left on for them to feed overnight and wake up in the AM and all are dead...
Oh well, didn't expect them to survive - maybe better luck next time. Will keep on reading and doing research