HI all.
Since my last post, I have lost all my gourami and barbs to face fungus...
Taking on board Pleccys advice I have now done the following (and maybe more .

After the death of the last fish, i surveyed the aquarium for a couple of days. there were no new cases to report, so i carried out a 50% water change first and while doing that, scrubbed out the the glass and cleaned out the other stuff like heater, thermometer and filter (in boiling water) and put them all back and filled with fresh water and left it for a couple of days. The water went cloudy (i think this may be the bacteria as described in an earlier post that must be trying to re-establish itself after the filter sponge getting a hot water treatment)

A further 4 days later, the water seems to be clear. I have done a test using eSHA aqua quick test dip strips. here are the results:

pH 6.4
KH 6d
GH >7d (but less than 14d is assumed i think as the next colour up was 14d)
NO2 0
NO3 0

Does this make sense to people? I think that the pH is a bit low, and there is no NO2/NO3. (Is it ammonia that breaks down to release NO2 and NO3...if so is it too soon after the filter cleaning as I have not tested for ammonia)

Additionally, I have ordered primafix and melafix and stress coat from API and added the following amounts:
primafix: 10ml
melafix: 10 ml
API stress coat: 25 ml

I intend testing again in 7 days and carrying out a 25% water change...

Have I done right or is it OTT?
Cheers
Jay