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Hi My 70 litre tank has been up and running for about 5 weeks now. I have 2 zebra danios. A week ago I bought 3 cardinals and all 3 have died. My amonia and nitrite levels are nil, with nitrate around 10. The pH is a constant 8.5 and my local dealer tells me not to worry too much about it...

I think I started my new tank at a similar time. I have a 70 litre tank with new gravel, filter sponges etc. I set the tank up with just water and gravel for 1 week, then added 7 plants. After a further 4 days I added 2 zebra danios. I now have a tank ornament covered in BROWN ALGAE and...