I have a ten gallon half filled with the male in it, it has floating plants, and tepm at 80F. i have 4 females in a tank next to him for him to choose from, but after i did a water change, he stoped building his bubble nests. i'm almost thinking about switching him out for another male, since i've had him for a while, about 5 months already. could he jube be getting too old?