For sale is a multi-species arrangement of 3 different varieties of Pinguicula (Butterwort). Of the carnivorous plants, Pinguicula is very adept at catching small fungus gnats that might exist in your other plant's potting mix. You can water from above, or below since the foliage covers the entire pot surface. Here at our nursery they just get doused with a water wand and it works fine!