Disinfection?

[Vanders]

I have just lost my 4 fancies (one globe-eyed, 2 calico fantails and a red fantail) in the space of a week to sudden disease. I think fungal in origin (frayed fins, appearance of almost like sloughing off dead skin/scales, bits of 'skin' left on plants etc), treated unsucessfully with finrot/fungal treatment.
Whatever it was it was fast and lethal.
I'd had the tank set up for years, use a Fluval 105 external filter, tank is approx 62 litres (its a 12x12x30 inch tank anyway). Also have an airstone.

I've thrown out all the internal deco (plastic plants, old stone bridge and castle) and am planning on replacing all the filter medium with new, get new plants etc, but I want to disinfect the tank and the filter plastic parts - is there a safe way to do this? I know fish are extremely susceptible to chemicals so don't want to create more problems than I'm trying to prevent!
Once I know the tank is disease free I'll set it up and allow it to cycle before getting new fish. Which leads to another 2 questions - what is the best length of time to let the tank cycle and I'd like fancies again, but want to get them from somewhere that really knows their fish - where do I start looking? I live in the Oldham/Rochdale are if anyone has specific recommendations!

Thanks for any help!

 

[Tolak]

For disinfecting I use 1 part bleach to 20 parts water. It's not exact science, I just eyeball it. I use it on a regular basis on water change equipment, and on hatching & growout tanks between spawns. You want to use the cheap stuff, as it has no soap. Chlorine bleach solution can be neuteralized with any dechlorinator, it's chlorine, the same as in your tap water. I rinse well, then double or triple the chlorine when filling.

One of my x-mas gifts was a gallon of bleach.

 

[black angel]

The tank wouldnt have been big enough for all those fish. Did you check your tank for ammonia, nitrite, nitrates and ph.
Sloughing of the scales/skin sounds like a ph crash to me and would indeed have been fatal.
For your size of tank I would only recommend the one fish. Ideally you want 10 gallons each for small goldies and then 20 gallons for the bigger ones.