this way that way, love these jag sex questions, first pull the planter, jags like a flat rock of love. get your self a flat piece of slate. as for sexing by tube , take a look at my mating pair, both have tubes that come down.
A males will be pointed forward as a females will be a drag behind like a shoot. to me it looks like 2 females as i see no male appendage , and a male never passes up a chance to spawn.