I had the most enjoyable experience at the FISH SPA at the Manila Ocean Park (behind the Quirino Grandstand) at the Rizal Park in Manila.
For (Pesos) PhP 120.00 guests are given 20 minutes to soothe their tired feet at the wading pool and the fish (pleco) will nibble on the dead skin of your feet. It's disturbing at first, but one does get used to the feeling of fish getting their fill on your feet.
The Fish Spa is on the second floor of the Manila Ocean Park. If you want to see the aquariums, you have to pay the entrance fee of PhP 450.00... but that's another story...