45 lbs will be lots. I have 45 lbs in my 90, and I was able to create 4" deep sand on each end (10" long) for my Jawfish. I used that calculator, and it told me to buy 70lbs for a 1" bed with the 10" long 4" deep ends. I took a bag back. Hehe.
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~ Mindy
SPS fanatic.
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