Quote Originally Posted by betiuminside View Post
Ohh I did more research and I will have a die off as some of the critters and bacteria won't be able to survive in the added layer... right?
This is an FOWLR tank, 1 puffer, 1 Picasso, 1 eel, 2 damsels.
Correct, this is why you slowly add the live sand over a few days. If you just replace with regular sand you should be ok if it has been washed thoroughly.

However, you still get a lot of cloudiness if added all at one time.