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how old are the bulbs?
you might need to dose the macro nutrients like in flourish comprehensive or mix your own from dry ferts.
how long has the tank been established?
it looks like you are using plain natural gravel for substrate. it might not have enough nutrients in it for any root feeders so you can also try feeding it root tab fertilizers.
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~Matt~
 If you put off what you can do today until tomorrow it will never get done cause tomorrow never comes. It's always today.  
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