I hold back larger females (since they tend to produce more eggs) and sell the smaller ones. I know a lot of breeders do the same and thus are applying selective pressure to the population. This is only for females though--I still use whatever males best fit into my morph project goals. Following this process the specimen size of my collection has no obvious increase/decrease. Given long enough the selective pressure on female size may start to become noticeable, but, not in the generations I have produced.
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