Texas Cichlid--Thanks for the heads up. Puregen helped a lot even thought I only have a sponge filter to set it next to. Did chuck the mopani though. Have other smaller wood in there now after two hour boil each and there are far fewer tannins to begin with. Tank inhabitant and I are both much happier. To everyone who did so many water changes for so long--you're a lot tougher and more patient than I am.
Saw the other day on anothe forum where someone said they just never had much luck with real wood in brackish tanks. Could this be a factor?