The manzanita has darkened as expected.... oh well. I really can't think of any kind of wood that wouldn't after soaking for a while... at first I kept getting a growth on the wood, and the sultan plecos didn't touch it. Geesh.. they were barely ever out. Since then I replaced them with some green phantom plecos and I haven't had to touch the wood once!
The wrigglers are getting bigger by the day it seems... haven't really changed much other than lowering the flow on the filters and adding an airstone...