I recently bought some blue pearls... i was very excited.... They have been thriving and growing in my aquarium... today I did a rescape... Planted some plants, took some rocks out... Added some in. I just came home to 3 of them dead on the substrate. I didn't do anythign differently... I even let the rock sit in a bucket for 3 weeks and tested it everyday. There was no change. The only thing I can think of is that the rotala came in some sort of aquatic soil... But I washed it thoroughly... I don't have a water test kit. I ran out using the last of it testing the rock. Why are they dying... All my fish, even the oto's are dong well...