A reply to deepin’ peat’s message:
There is a successfull method that has been developed by one of our first good breeders of Paros in Germany, Jakob Geck:
Put the free-swimming larvae in a round jar of about two liters with a round bottom. Add two or three small snails. Then, every day a few hours after feeding Artemia or other small food stir up the water with a stick by circling moves and wait. The debris will assemble in the middle of the round bottom of the jar. There you can easily remove it with an aeration hose without endangering the fry too much. The missing water is to be replaced by new water of the same qualities; it’s not more than half a liter. This is all. When the fry has reached an age where they need more space, they will be put in a bigger tank with a sponge filter.
Jakob Geck has raised many generations of many Paro-species by this simple combination of intensive, dense feeding and relatively moderate water change every day.