Hi Bill,

Have you had a chance to gravel vac that section? If compacted heavily, it can produce hydrogen sulfide which is toxic to all.......

IME I had 1/2 of my 180 with wendti at one point and did not cause any issues. Was doing a bit of c02 at the time, regular floro tubes, but no other ferts using flourite. Was able to grow other things with no problems.

Clean out that side of the tank and ensure all old roots, etc is gone.

Then again try some of your new cuttings.

I don't think the wendti is inhibiting it.

I think the specific area is the problem.

Let us know.