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HELP! MY FISH KEEP DYING!!

Subject: HELP! MY FISH KEEP DYING!!
by mrloach on 10/4/2013 19:35:06

Hi. Dont know what info you are going to want/need to try and help me, but here goes.
I have a small 20 litre tank. Got filter and aeration.
Started with 2 american flags, comet(?) 2 danios. 1 flag dies and comet. Then got fantail, and few weeks later that dies!
recently had 1 American flag, 2 danios, 1 shubunkin?,1 goldfish, and loach. first shubunkin dies, then loach.
Done water change with water safe, now goldfish died, and 1 danio on its way out! Have water test kit, and been monitoring every week. When shubunkin and loach found dead, n02 and n03 were way too high(but went from fine to that in space of 3 days!!??), which is why i did water change.
what is happening here?? possible causes anyone??
my little boy has been very upset, and its costing fortune!!
is tank too small??
HELP!! please...