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Went through the linked thread... Severums have been inter-bred to such a large extent that its very difficult now to know which is which (except the golden and red spotted.).Read this maybe it will help determine if
you have rotkeil or green. It could be taking a little longer for them to develop the red.
They haven't been officially described to this point, hence the "sp" in sp. 'rotkeil'. Also, some doubt their lineage, as to whether they're a natural, wild fish or not.
Based on the size description I wasn't certain which ones were in question, whether it was the smaller ones in the back. If it's those in the lower center of the photo I completely agree.The ones in question are not rotkeil, IMO. The rows of black spots are not usually seen in rotkeil juvies. Also, rotkeils usually have bright orange or red anal and pelvic fins, while yours are dark red/maroon.