Just to let everyone who has kindly helped me know that I think I may have uncovered the problem -
Water tests all ok - amonia, nitrate, nitrate and pH all at the recommended amounts.
Was doing a 50/50 water change and thought that the water felt very warm. Tank Thermometer said 24 degrees...
Thanks Athena. That is exactly the sort of step by step advice I really wanted / needed. I have the liquid testing kit now so I shall follow your advice with a 50/50 water change and hopefully before too long I can enjoy the fish in the samw way all of you guys do.
I shall check out that link...
Thank you for all the helpful comments so far - it makes me realise just how little I know.
I am using testing strips which do sound pretty inaccurate from what everyone else has been saying.
Water changes - shop recommended every 4 weeks which is obviously not very good.
We started the tank...
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Tank size: Rio 125
pH: 7
ammonia: ?
nitrite: 0
nitrate: 0
kH: 80
gH: 60
tank temp:24
Fish Symptoms (include full description including lesion, color, location, fish behavior): Zebra Danios some of them get severe curvature of the spine which I've heard happens when they get old...