Planted Tank Guru
Join Date: Nov 2009
Location: Missouri united states
Previous post's indicate the BG Algae was treated with ? recently.
Depending on what was used for treatment,how much,and for how long, or whether filter media was removed for treatment,or filter cleaned after treatment if media was not removed , Dead plant matter,organic matter, and dead bacteria,maybe ammonia eminating as result yet.
Would just keep changing water daily if needed, until biological filter is restored.
Would clean filter material in old tank water or dechlorinated water only if it has been some time since last cleaning.
Filter media should not be that dirty with only shrimp in the tank .
Osmocote is best used sparingly for it does contain some ammonium.