I think the fry will experence a high mortality rate going through the pipe work. For example, there is a 98% fry mortality rate going under weirs on rivers because of the huge changes in pressure damaging the internal organs. I dont even syphon fry any more because of the issues faced with fry getting damaged in the syphon tube or the spash out of the bottom. Their underbellys are extremely sensitive and any sort of splashing onto it will damage them, often beyond repair.
I like the idea, but unfortuantly i think there will be issues. It wont kill them all, there will be some that survive, but im not sure what the ratio would be of survivers. It might be high enough that you are ok with it, it might not be.
I too got annoyed at having to catch the fry out of the breeding tanks and transfering them to the grow out tank. So i changed my plan. I built a large fry saver out of a tupperware container which is big enough to take a cave with plenty of room to spare. When i have a male on eggs i will carefully take the cave out of the breeding tank and put it in the fry saver in the grow out tank. I too use the same water so there is no issues there but i always do a test anyway, just to check for ammonia and nitrate mainly. Once the fry are out of the cave i wait for about 2 weeks then let them go into the grow out tank while i take the male and cave back to his breeding tank. Works well so far. only issue i have found is having multiple spawns at once. I dont want to have two caves in the fry saver at once as this will most likely have issues so every now and again i have some that stay in the tank with mum and dad as the fry saver is already in use.
doing it this way save lots of time in catching fry and the stress of transfuring young fry around. when they are eggs they are totally oblivious and most of my males are experenced enough that they dont mine the slight wobbles (of course i do it really slowly and gently).
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