Either they had a tiny spawn and the rest of the nest dissipated, or they didn't spawn at all.
Yesterday, the male (Jules) started violently attacking the female if she was on the side of the tank the nest was in. Once, he caught her UNDER it while he was turned away, and he chased her all the way to the other side and was ripping her fins to shreds while she was cornered, so I scooped her out, and he went over to the nest again. He's been staying over there diligently blowing more bubbles under the one leaf that's leaning against the wall, and won't even come out to try and scare me away. So I'm going to leave him for a couple days and then check to see if there are any tails hanging.
If there aren't, then I'll pull him and recondition him, and try again via the Thai method. In the meantime, I'll try again with the blues.