08-17-2013, 08:06 PM
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The yellowishness is tannins from your driftwood, like you said. It won't hurt fish, it actually can be beneficial. I have a blackwater tank I intentionally have that color. Boiling the driftwood is usually the quickest way to be rid of it, but seriously you can just let it go unless it bugs you.
The green water is from algae. Multiple causes there. Too much light is one. What light do you have on the tank? Does it get direct sunlight? Too much waste/nutrients are another. This could definitely be the case. I do at least 25% water changes weekly. You might want to up your's to see if that helps. It will also cut down on the tannins if you change water more frequently.