Bought a few Endlers last week. They were gorgeous and seemed very healthy and lively but after the first couple of days one by one they have all died, usually one or two a day. They were feeding fine, no loss of vitality, no loss of colour. The only indication was that they would suddenly stop swimming and skulk in the plants about half an hour before they died. No ammonia or nitrite in the water and low nitrates. The only thing I can think of was that maybe the water didn't suit them. What water parameters do those who keep them successfully have? Looking online, there is quite a wide variation in water pH etc quoted so I'm a bit confused as to what has caused this. The staff at the shop assured me my water would be fine for them Would really like to be able to keep and these lovely fish but don't want to even think about getting more unless I can figure out what went wrong.