I've been playing around with calculations.. Alot... alot alot..

anyway, I discovered a discrepancy which I cannot account for..

Perhaps you guys can?

If you look at the attachment (and I apologize for the quality, but there's not much room on this site)

You can see that all are same settings, but the result is different.

the spreadsheet are numbers based on Tropica's Aquacare product, then there's the fertilator from APC and finally Nutricalc.

All 3 should, in theory, use the same numbers, if taken from Tropica's figures, and the end result should be the same.. but it's not...

Can you spot the problem?