Quote Originally Posted by rodsboys View Post
Cories do not do well as cycling fish. Try to transfer over some media, water will do nothing for you so just use new declorinated water. 6 cories will be fine in a standard 10 gallon for most species. A lot of breeders do 10 gallons for small breeding groups.
I cant transfer over media from this filter. It is a single cartridge plus biowheel.

Thanks