I have mentioned in the past that I have several aquariums, and with that, lots of fish. On Saturday I bought two Tiger Hillstream Loaches. However, on Sunday, both were dead, no reason for this as my water was perfect, all filters were working, the water was fully oxygenated, and there are no diseases present, so I was at a loss. I have fish in the same tank that needs perfect conditions. These fish, however, are quite tough and only need a flowing tank, mine is medium flowing, so that should not be a problem. I took them back to the aquatics shop and they were at a loss as they tested my water and said that it was fine too. They gave me a credit to use for the cost of the fish as I did not want to get another two and the same happen. I may get some at a later date, but for now, I will give it a miss. If I do get some later, I could always set up another small tank for just them to thrive.