09-01-2011, 11:50 AM
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A water conditioner that detoxifies heavy metals (most, but not all, do) will obviously detoxify the mineral nutrients in a fertilizer that are heavy metals. Iron, zinc, nickel, manganese are heavy metals and important plant nutrients. If your water conditioner detoxifies metals, it would be best to dose the plant fertilizer the day following a water change. I had the folks at Seachem tell me this with respect to Prime and Flourish. Now, I can't say it would make a great difference, but if there is a chance that the conditioner will negate the nutrients, I'd prefer to wait a day rather than risk wasting the fertilizer.
On the wood tannins, yes, there is no health risk to fish. Unsightliness is the only drawback. Some fish (those from blackwater habitats) will find tannic water ideal, and might even spawn. But none will be harmed. Part of the haze in your photos may be normal in new tanks, and likely bacterial in origin. I have new setups that sometimes take weeks to fully clear from this, others do so in a couple days. Not a problem, unless the fish show signs of trouble.