Originally Posted by
slicksta
Perhaps, but I wouldn't know how else to explain it.
Additionally, maybe I'm using "headstand" in other than the typical manner.
I'd say in 15 years I've seen it about a 20 times, usually affecting the same fish in a particular group and only witnessed after feeding freeze dried worms . Within 30 minutes of feeding the fish will point its nose about 45° downward and seem to do a bob in place. It can swim normally around the tank, but when stationary it will revert back to the nose_down bobbing. This will last up to two hours and then the fish will be perfectly normal again.
This has only been witnessed after feeding freeze dried worms. After taking the precautions of a long soaking and pre and post feeding other foods it happens with much less frequency and less server in those rare occurrences
I haven't witnessed it with Al's fdblkw, but I have with California fdblkw and SanFran fdbldw