Redclaw Cherax quadricarinatus behaviour is contagious

These Redclaw all came from different IBC’s and were bred by us. But when put together in the same IBC container their behaviour started to change. With only 1 redclaw acting “strange“ on the first day, it spread to the whole lot doing a “crawl“ day & night within a week. I was changing water every few days, pumping more air into the water, adding more food etc trying to work out why they were not acting “normal“. Months on & they are all still crawling. In the IBC’s around them, none exhibit the same behav