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Hey

The piece of DW in my nano tank has been there for about 4 months now and was soaked for 2 weeks prior to placing it in the tank. It appeared to stop leaching tannins after 2 weeks in the tank (ie 4 weeks total submerged).

I added an otto to the tank a couple of months ago and since then the tannins have reappeared - even with twice weekly water changes (10%) and weekly carbon changes I still have water the colour of strong tea... I don't mind a little tannin staining but this is a bit excessive.

Is it possible that the otto sucking / rasping on the DW is causing the wood to release more tannins or is the introduction of the otto and the apparent increase in tannins just coincidental?

G_T

Never be afraid to try something new. Remember that a lone amateur built the Ark. A large group of professionals built the Titanic.

Looks like you have a piece of DW that just releases tannins no matter what you do. I would think it is just a natural break down of the timber. It is possibly a softer wood which tend to release most of the tannins.

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Keith

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Hi,
Actually, yes, the fish is probably causing the increase
in tannins. As the tanic acids leech into the water an
area of depleted tanins forms and acts as a sort of a
boundary that retards the leaching process. In essence it
forms a weathering rind. The rasping of the fish digs
into the rind if not through it, and allows the tannins
deeper under the surface a way out.

Frank


-->>> The Confidence of Amateurs, is the Envy of Professionals <<<--

Combination of both... soft wood and the otto..... for the the for mentioned replies

Djrichie
"So Long, and Thanks For All The Fish" Douglas Adams