Ph 7.0
Nitrite 0
Ammonia 0
Nitrate 40
with this data...what you need is just a water change.... no need to clean
the filter. high nitrates mean you have enough good bacteria colonies that
convert toxic nitrites into nitrates.... water change will bring down the
nitrates. however..since you did replace the filtering media... a bacteria
bloom happens but will eventually settle down in few days.
when i was hit by bacteria bloom leading to green algae, a 20% water change daily
give me crystal clear tank in 5 days....