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Re: [APD] Welcome to the "Aquatic-Plants" mailing list (Digest mode)

>   Hi,
>   I would like to know what is the best indicator for 
> insufficient lighting?  I have 300gal newly setup tank and I 
> have 2 150 watts Metal Halide and I have some plants that are 
> still dying.  The plants that are dying are with red leaves.  
> Some of the plants, e.g. Micranthemum umbrosum,have very nice 
> roots but they are not growing very well, never grew an inch. 
>  I have Co2 injection and almost all the plants will produce 
> bubbles.  With this kind of situation, do I need to add a 150 
> watts of MH?   
>   Thanks,
>   Edison

300 W over a 300 gal tank seems too low for me.  The generic rule is the
watts per gallon.  I would stick with at least 2 watts per gallon of
tank.  Obviously there are many exceptions and variations of this as I'm
sure many people will point out.


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