Many moons ago I had this plant(from ICPS seed) takeover and eliminate all the other cp in the tank. Flowered constantly.
While U. longifolia will probably enjoy the pot, that may not necessarily be a good thing. Utrics, in general, like to spread themselves around as much as possible but as B. Rice notes in his U. tridentata description (in section Foliosa w/ longifolia): I have one tank which I have cleaned 'all' of the longifolia from twice, only to have it reappear months later. Mine now enjoy a windowsill where they are somewhat less likely to invade their neighbor's pots....(& still flowering after ~2.5 months!!)