While there are brackish water anemones, only one is currently traded as such, the beadlet, Actinia equina. This is a hardy, coldwater species that does well even at tropical temperatures provided water quality is good. It is not photosynthetic. In the wild these anemones are not normally exposed to very low salinities for long, and in the aquarium should probably be kept at SG 1.015 upwards, and it is questionably whether even that level of salinity will do them much good over the long term.