I find the behavior odd. When you say 'now', were you saying the water parameters differ from what the results you have now?Trishfish said:I just did my weekly 30% water change today. Params have been stable before changes but of course now they're ammonia 0, nitrite 0, nitrate barely at 5. I've seen this behavior for all the time I've had them and they seem to do it in pairs. I was wondering if it was somehow a mating thing.