>I have had to use 2 blocks in tank that have a hundred or so fry in them as
>the load on the Calcium is quite high and 2 work better than one BTW
>
Roy have you measured the value before and after adding the blocks?
I'm really interested in getting some quantitative data on the calcium
requirements of rainbow fry. By the way I also mangled a batch of
mogurnda mogurnda with too low of calcium. They still give great fry
but but the tails are a little messed up. Most of that batch were just
culled they were so bad. I'd estimate the calcium in the water they
were raised was 20 ppm by the RO to tap water mix I was using time.
Cary Hostrawser
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Minnesota Aquarium Society
http://www.mn-aquarium.org/
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