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the red ones are F3 the others are F1 and F2. I used to breed mostly taitibees -hybrids of Taiwan Bee and Tiger shrimp. Now we have better genetics to use - aura and Galaxy shrimp so there isn't so much interest in the ordinary taitibees. With early hybrids it was hard to establish a line that bred true and once I got to F10 I was getting more shrimp that looked either like Taiwan Bees or Tigers. After 6 years i never established a true breeding line. My opinion now is to keep pure lines pure and use culls from your pure line to experiment with the hybrids. we seem to be losing pure Tb and even the pintos were originally a hybrid that generally breeds fairly true although we seem to be losing the good patterns. people no longer seem to be culling out the irregular patterns so you usually see all types of patterns in tanks. When we had our pure lines they had distinct patterns rather than the random patterns you see now. Since we are getting more variety entering Australia - please remember it is still illegal to import shrimp but they are getting here - we have more opportunity to breed exciting patterns that were not available in the early days of shrimp keeping here. At the end of the day it is what ever interests you - if you want to experiment then do so - after all it is a hobby that we all enjoy. As long as people let buyers know their shrimp are hybrids then there is no harm. Unfortunately you need lots of tanks to breed hybrids and have tanks for pure lines too. I have resorted to putting my culls outside in ponds where they still breed despite no heating in winter and no cooling in summer. In the last picture you can see the random patterns I'm talking about these are in fact Taitibees some have pinto genes butthey don't have the nice crisp bands that good Taiwan Bee should have