I have two 5inch Sydonsis, two blue rams, 6 Cardinals, two small Corys and plants but am getting scum on the top of my tank. Before I set up this tank the two big cats were in a tank filtered by an external filter, during the setting up of my new tank the filter was removed and replaced by a smallish internal.
I never had scum with an external filter.
I just remove the top 'layer' of water when doing water change and that removes quite a bit of it but I am a bit worried in case it prevents the uptake of oxygen by the water.
Any help gratefully recieved.
Dave.
http://www.thehungersite.com
Click on the hunger site and help feed the hungry.
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