I just recently purchased Chemi pure Blue (11 oz). I have a HOB on my 43 gal bow front tank (FOWLR). Where exactly do I place it on my HOB? Its a CPK back pak style. If I placed it in the wrong forum, please correct.
there is really no wrong place to put it as long as you have pass through. However, you should put it after your prefilter (sponge,pads, and/or filter floss)