So, I have one common Hoya, in a tank right now, that I'm betting is going to be an excellent plant to grow out of an aquarium... it's doing well so far, & is a cutting from a 100 ish year old house plant, that used to be my wife's grandmothers... there are several varieties, that we have had as house plants... ( variegated, with whites & pinks ), curly leaf... but I just found a variety, that I had never seen before, & I'm going to try it in a tank... it's called a "Black Margin Hoya" ( Hoya Verticillata )... assuming it is a flowering vine, like the rest of the Hoya clan???