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If sunlight is the only difference it may be worth looking into getting a clamp on desk lamp to see if that may be the cause. I wasn't sure how cold your nights get there but didn't think that sounded like a long term solution!
Mike
That's interesting, when they are on the rack is there anything under the bottom of the tank? Maybe light from below is confusing them???
That would be an interesting experiment if that is the case! Mine are sitting on an island countertop so there is something under them.
Mike
I can assure you that it is not a genetic issue as I am currently raising fry from siblings to yours without issue. My bet would be that it is a tank or water problem. What I would try would be to set the tank up like you run it and give it a bleach bath to kill anything that could be affecting...
Hi JJ,
Where and how strong is your air source? I would start with an airstone about an inch under the surface at 50% flow, they will most times run up and down a corner or end of the tank nearest to a light source.
Mike
Hi JJ,
The heater in my 5 gallon is a hang on stlye so it has to cover most of it! LOL
The larger the volume the more stable it is also, usually the fry group to a corner or end of the tank near light. Maybe an airstone on a medium flow near the surface gives them a current to swim in?? I...
Hi JJ,
I start mine in a 5 gal, full, feed them small amounts of San Fracisco strain BBS as they are smaller. I use a airstone near the surface to cut down on the amount of current it produces and a heater at 82 - 84 degrees. If there is any food after 30 minutes get it out as it will go bad...
They are not hybrids as they breed true, 100% of the fry I have raised have turned blue by 3 months old. Ste12000 is right about the sexing, if you see enough rams there are subtle body differences that show and a full female is obvious.
Mike