I have had my 200l Tropical freshwater tank full of water and cycling for nearly 3 weeks now and when I went to top up the water tonight ready to get our first lot of fish tomorrow I noticed that there is brown algae(im guessing its algae) particles everywhere, on the gravel, plants (silk), heater and filter! Last time I had a good look was a week ago and it was clean - the light hasnt been on and it isnt in direct sunlight.
The algae isnt on the glass and will float around if disturbed. There is also what looks like mould on the filters air-in tube (below water level only)
Can I put fish in the tank with it like this? A clean up will require a huge amount of the water be changed and there is no guarantee it won't come back?
Please help, I'm on the verge of emptying it and starting again! :(