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Re: Aquatic Plants Digest V2 #917

>I think you should be adding another source of calcium if you are not doing 
>so. I don't think coral will supply enough calcium for long term plant 

I posed the question of how much calcium a couple of months back.  The
general consensus seemed to be that 10 to 20ppm was enough.  I would still
like to nail that down some.  Calcium chloride works without affecting the
pH but I don't want to add it if I don't need to.  The calcium carbonate in
the crushed coral seems to be doing the job right now.  I test for calcium
on a regular basis and it is staying pretty constant at 30ppm.

k5vkq at ix_netcom.com