finally put my large piece of driftwood into my 100g a few weeks ago and few hours later the water turned an odd color (not the driftwood tinge) and my thinbar started swimming at the surface with his mouth above water. he as well as the rest of the fish are fine now and the driftwood removed. i did 25% water changes every other day over the course of week and all seems good now. Im thinking something might have got into the driftwood on the move to japan. so be careful if you ever have to transport driftwood or decor and are reintroducing it. i think it may have picked up some kind of chemical from the trash bag it was wrapped in for the move. im scared to use the wood now..lol.