You can do a Bleach dip but I find that a little drastic. It is my last resort. I prefer to use H202 at about 2 mil per gallon.
http://www.gpodio.com/h2o2.asp
Here's a link to help you with H202. You can do a spot treatment or a whole tank treatment. I find it easier to do a whole tank treatment first. There are many ways here you can search for and find different ways.
http://www.gpodio.com/h2o2.asp
Here's a link to help you with H202. You can do a spot treatment or a whole tank treatment. I find it easier to do a whole tank treatment first. There are many ways here you can search for and find different ways.