01-23-2010, 08:40 PM
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Welcome to the forum!
You mention your parameters for your current set up, but what is your actual tap water readings for hardness & ph????
Discuss need pH 5-7 and Hardness < 10 degrees, just because your store houses them temporarily in ANY water does not make a difference to the fish needs if you want to have long term, healthy & happy fish, please don't let the aspect of what a fish store does fool you.
Substrate will not mess with your pH unless you are planning on using crushed coral or something which I'd not recommend with Discus. Driftwood, if boiled properly neither, it may give of a LITTLE but in relation to 90g you won't even be able to detect this change with a normal test kit (eg API).
The 2 actinic you have are prop far too hgih in the blue's for plants so I'd not recommend them. Bulbs named Daylights are generally in a range of 5-6500K which is perfect for plants. So I'd suggest you exchange the other 2 bulbs, go to the home store near you, pick up a 2-pack of Daylights or Ultimate daylights (always get something ideally @ 6500K for plants, thou a mix of 5K and 65K does well too)available by Phillips, GE, Bright effect, cost you around 10 bucks or less. And then the plants will thrive. With t% I'd get a wattage that'll equal in total of your bulbs ~1 watt per gallon in the end.
Like I said go to the home store, Lowes, Home Depot they all carry these bulbs. Feel free to check out my tanks here under my name on the tap called "Aquarium" lists all my planted tanks and all these are ran with "home store light"