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I guess it depends on how much water you intend on changing. I only do 20% everyweek or sometimes every 2 weeks. So for a 60 gal, you'd change 12, which is less than 12 5-litre bottles. So 4 bottles at a time is only 3 trips from tap to tank. But yeah depends on how much you're changing in one...

They're best kept in pairs anyway, opposite sex.

I agree with Colin_T. You probably poisioned the fish by treating the water after it was added, and not adding treated water. The stuff I use says it neutralises chlorine and heavy metals straight away, so I simply add the required amount to a 5 litre bottle, then fill it with fresh tap water...

I had a blue dwarf gourami which had been fine for 3 months, and just the other day I did my weekly 20% water change, using the water conditioner as usual, and hoovered the gravel, and I also decided to add some nitrate remover (which says on the bottle completely harmless to fish) and some...