Tank size: 26(UK) gallons
pH:6
ammonia: The only test kit i can get hold of atm is the strips which doesn't contain this reading and I've heard aren't too accurate anyway..
nitrite:0
nitrate:10
kH:3
gH: 21
tank temp: 26
Fish Symptoms (include full description including lesion, color, location, fish behavior): It's a marble colour, orange/black/white. Small white kinda dots on the side fin with the fin shown to be damaged, it looks like pictures i've seen of velvet with like a kind of coat on it. All other parts of the fish are fine from what i've seen. It's behaviour has been of still very responsive to food and still moving well up and down the tank though every so often it seems to try and nudge up against leaves and breathing heavier than usual.
Volume and Frequency of water changes: Last week i did a full gravel clean with about 40% of the water being changed, before that it was over a month before it was last cleaned due to external reasons
Chemical Additives or Media in your tank: Only thing i've used is bacterlife.
Tank inhabitants: 2 clown loach, 2 angels, 2 small catfish (had them years so forgotten their name)
I'm currently getting this tank up and going again after the neglect its recieved and by reading these forums after the last view days to update my knowledge (which most was from a local fish shop and sadly seems to be wrong). Also when cleaning my tank out I had (which i later on here read not to do) cleaned out all my filters using tap water then soaking them in my last bucket of water that was going to be emptied into the toilet before re-installing the filters in the tank which i'm feeling guilty about

Could this affect the cycle of my tank aswell?
Recent additions to your tank (living or decoration): Live plants(5) from local store were added last week after i did the water change.
Exposure to chemicals: Not as far as i'm aware.
I will try and get a picture up but my digital camera is in the retail shop being repaired.
Thanks for the replies i'll read back tomorrow when i'm up.
Tony.