Help! Tank Suddenly Full Of Algae.

Hi there.

I also have those filters in my tanks. The instructions do say to take the whole black box bit off and replace it. I was lucky because I had read information on this forum saying that the filter media did not need replacing, just a gentle swill in old tank water. After reading that pearl of wisdom I emptied the carbon out of all of them and stuffed the holes with the foam from the new filter cartridges I had already bought in anticipation of the suggested monthly media change. For my oldest filters that was back last October and they are still going strong.
Saves a fortune in replacement media. 

Good news My tank is looking great. No more algae and lovely clear water <3 And all fish swimming around happily 

Thanks so much for all the great advice 

Emz x

Excellent!!