The time has come to change the filter media in my Fluval Edge 23L. I have noticed a drop in the performance of the filter recently with my weekly water tests showing a small rise in the ammonia levels after they had stayed at a healthy zero for a month or so. Seeing as I have had the tank since around April, 4 months seems about right according to Fluval.
So as mentioned in my previous update thread, I bought the replacement carbon which comes in a pack of 3 and the filter sponge and BIOMAX.
Looking at my used BIOMAX on the left and new one clearly shows that this is probably the cause of the drop in efficiency of my tanks filter!
The sponge! Well it’s not looking good. However there is something to consider here with an established and cycled tank, that’s your beneficial bacteria. They will be located all over the tank but the greatest concentrations are found in the sponge itself. So replacing this entirely isn’t necessary as long as you give it a good swirl around in a bucket of tank temperature water. It’s not advisable to use running water. You want to retain as much of the bacteria as possible because they keep the ammonia in your tank down. Replacing it completely would effective mean the tank is uncycled and you would have spikes in ammonia which would be very bad for the fish in there.
Fluval Edge Maintenance
So after this was done and the gunk and debris was remove from the sponge. I put everything back together and set it back up. I had a bit of a panic because I thought my filter pump had broke but it turned out there was not enough water in so I put a cupful of clean water into it and it began to work properly. Apparently it’s bad to have it turned on without water in it, oops. Hopefully no damage done!
Here are the items I used during the Fluval Edge maintenance if you are interested in purchasing the same ones.