Sure it can be used - don't know about adding any nutrient element though - but might give a little shade & make discus feel just a touch more comfortable (from the lighting) - thats about the best you could expect. But hey, give it a go - nothing wrong with it.
If you can afford it, shrimpnewbie - go for it - you have a great tank size for it - it's very satisfying and I don't think you would regret it.
And for what it's worth, I'll be here to help, if you ever need me.
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