flushing is NOT a cure.
tanks do NOT cost very much money at all. All you need for a QT
is a small 10 gallon tank, a HOB
filter with a sponge and a heater. Thats all you need for a QT
Set up the HOB
on your main tank with the sponge filter so the sponge can absorb some bacteria. Then put water from your main tank into the QT
and move the HOB
to the QT
Put your fish into the QT
and treat just the QT
tank until the Ich is cured.
You MUST leave your main tank absent of fish for... I can't remember the duration, but I believe it is at least 3 weeks to be sure the ich dies off.
After that, acclimate your fish back to your main tank's water and temperature.