Don't know of this has been resolved. But, I had the same issue in 135 gl and 45gl well established tanks. The manzanita sank well and after a month or so it began to grow that algae hair looking thing. I acquired some mollies to provide fresh live food for my cichlids and housed them temporarily in the tank with the manzanita. They took care of the problem immediately. In one tank I was able to leave them in their and the problem has not returned or at least the mollies don't give it a chance to sprought. .