08-22-2010, 04:03 PM
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I concur with what has been said since my last post. There is clearly a build-up of organics/nutrients that is out of balance.
I saw nothing of liquid fertilizer. Substrate ferts are fine, but obviously only for substrate-rooted plants. If you have floating plants or non-substrate rooted plants like Anubias and Java Fern, they will need a liquid as they only assimilate nutrients from the water column and Eco-complete is formulated to only leech nutrients in conjunction with plant roots/bacteria. I've no idea how, this is what the manufacturer says. It makes sense, as plant roots release oxygen for the bacteria and this could be a sort of catalyst.
You have fairly bright light (double what I have on any of my tanks) plus CO2, so you will need balancing minerals. A liquid fert may be needed, just as a suggestion.
I would reduce the light, you have already done this. An hour makes quite a difference. I saw hair algae slightly increasing, I cut back by one hour to 11 hours, it stopped. Monitor what you've done for a week.
Blackouts work (sometimes). I prefer water changes, but first the balance has to be restored or it will just occur over and over. But now that you've reduced the light, try a water change (50%) alternate days, every day, as needed. If the light reduction was sufficient you will see a difference.