Aqua Tom
Fish Gatherer
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Only question is; after water change just prior to stocking do i keep dosing at 4ppm or do i reduce to 2ppm for a day or two?
If ther is going to be a days gap between waterchange & stocking I wouls suggest a low dose of ammonia, 2ppm as you said, any more & you run the risk of raising the Nitrates that you have just lowered by the waterchange.
Personaly i did my waterchange in the morning & got some fish in the afternoon.
Just set a day aside for it & if you have family shoo them out the door while you do it.