My community tank water always looks green - I don't know what it is or how to get rid of it (see pic) - in the pic, I've actually just done a water change and cleaned the tank out! It's better but still very green. I have two smaller tanks that aren't filtered and have no problems with green water in them (and they have plants in them too).
The community tank has 2x silver dollars, 2x angels, 6x khuli loaches, 6x cories and 1x BN.
It's filtered and has one plant. I don't use the tank light much as the dollars freak out when I turn it on if the place is dark first - but the room gets plenty of light so the plant is growing happily (also have one of my smaller tanks in the same room).
The fish seem fine - have had them in the tank for years and are not bothered by the green filament at the bottom of the tank or the colour.
So, what can it be and how can I get rid of it? I notice there is a lot of greenish film sitting at the bottom of the tank which is regularly siphoned when I do a gravel clean, but a layer quickly builds up again - assume this is the culprit but no idea what it is.
I also have wood in there for the BN - could this be the cause of the problem?
I'd just like a clear tank for once.