Just a Quick remark, which is that yes, this will be not unlikely to happen with linkei, which is why we often recommend linkei to beginners, they are the least delikate of all species.
You will most likely not find the same with many of the other species.
But, in general, theres no reason also to keep paros in the lowest pH range, they do tolerate higher levels. But then again, it is not helpful for their general wellbeing to be kept in less optimal conditions, and normally a spawn of linkei Can be very productive, not just a couple of frys.
So, just to say, yes, it is quite possible with in particular linkei, but not really recommendable ?
Whether this is sseasonal or not, I dont know, it could also just be that spawning related ro a waterchange you did
And a ps, I should Warn you, that there are really few people using the Forum these days, people use the facebookgroup a lot more, ?, So if you find it a bit quiet here, thats why..