RBF, Glad to hear there's a normal formula out there for figuring out weight! Wish they told me that in school instead of making me do scary long math.
Here's another releasing tip -- Keep the fish on the wet rocks, and try not to handle them too much. If you take off alot of their "slime" or if they lose scales, it can make them more susceptible to parasites and diseases, because the goo and scales work together as a protective layer.
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