The process itself is one I have tried, so I do have first-hand experience (or first-foot, ha-ha-ha-ha-ha-ha-ha-ha.....et cetera). Personally I would describe this therapeutic treatment as 'Mildly Embarrassing'. It involves sitting for a quarter of an hour with your feet in a fish tank trying to look as though this were a perfectly natural state of affairs, while passer-bys stare at you with a mixture of curiosity and disdain. Then you try to extract yourself without squashing any of the fish and dry off, all the time mumbling platitudes to the eagerly hovering licensee.
In the interests of fairness, I should point out that I probably do not fall into the demographic to whom doctor fish appeals, so by all means try this out for yourself - you will not have to look hard to find a venue in Malta... for the moment at least.