Effects of tannins on flora/fauna
Hey guys. I've just started setting up my first planted tank. So far I just have Eco Complete, some minnows, some java fern and a chunk of grape wood in there now. I have some RCS and some other plants on the way, but not here yet.
My question is: I boiled the grape wood for about an hour and soaked it for a few days, but I'm still having to weight it down in the tank and it's still leeching tannins into the the water (quite a bit, actually). What affect with the tannins have on the fish, shrimp and plants? Anything negative I should be concerned about?