I got 4 golden zebra danios for my 60 litre tank (D:30cm H:40cm W: 60cm) back in August and as the weeks have gone on they are becoming more and more subdued, one of them just stays at the bottom of the tank most of the day except when I feed them. What am I doing wrong?
I check their water regularly and there is no ammonia or nitrate issues and I change 10 litres every week. I feed them twice a day a tropical fish food, enough for them to consume in a couple of minutes. There are also no obvious marks / funny swimming or discolouring on the fish to suggest an illness. The tank is about 22 degrees.
Are they lonely? I realise I should have bought 5 danios as a minimum, so is being four causing them an issue? If so, should I buy more of the same type of fish (golden zebra danios) or will any other type of danio or compatible fish help?
Thanks for the reply. Nitrite is fine as well, so water quality is fine.
That's frustrating to hear about the size of the tank - I tried to do so much research but didn't see this anywhere, I was concious this was the minimum size tank that was appropriate, hence why I only got four. I can't get a bigger tank due to size of may house in general... so what do I do?! Is it kinder to get rid of them? I don't want them to be unhappy.
Your options might be: * asking if the LFS that you obtained them from would swap them for a species more suitable for the tank size as you hadn't been aware of the tank size requirements (they were effectively mis-sold); * if no luck, advertise your fish on http://aquarist-classifieds.co.uk/ (if you're UK-based) to maximise the possibility of them going to a suitable home; * do your research beforehand by browsing around https://www.fishkeeping.co.uk/modules/caresheets/ and the more up-to-date https://www.seriouslyfish.com/knowledge-base/ to find species more suitable for your tank size (eg male endler guppies if you have hard water or ember tetras or harlequin/espei/hengeli rasboras if you have soft water).