Dart Den

I have a 46 gallon bow front and its about 3 months old. Recently I noticed very small white fish like organisms swimming around in my waterfalls and water areas. I was told it was water mites and that I just need to change the water. Well I did that and they are still there and seem to be multiplying. I just lost a leucomela today so now I am starting to worry. Do I have to gut my whole tank and start fresh? Is there any way to control them and kill them without harming the frogs? Are they even harmful to the frogs? What should I do? please help !

"Water mites" seems like a broad description. Are you able to take a picture? It's possible that what you are seeing may just be springtails that have found their way into your water feature, and are crawling around on the water surface. What you are seeing may not have been the cause of your frog's death, and some fecals may be in order.