Hi all. I've had a fairly active Demasoni breeder tank set up for over year. Had virtually no issues at all and they have been breeding really well. The last few days they have been acting very odd. No one is is coming out all day and staying in their caves and rocks. In the evening though they all seem to come out or at least much more active. It seems they have been doing it since my last water change which was about 50% as normal. Only thing I have done is changed my auto lighting to start later in the day as I was concerned they were on for to long. Does anyone have any ideas why such an active group are now pretty much non existent. Also did a full water test.....ammonia 0 nitrites 0 nitrates 30