water changes

read the label

Some bottles say it works instantly. Some say to add before adding to the aquarium. I've not seen any that suggest any wait time is needed.

I've seen one site, for VERY expensive fish, that said to add the dechlorinator to a bucket and then leae the last few inches in the bottom of the bucket (apparently for the heavy metals that are taken out of the water by certain dechlorinating mixes). This is overkill for my $1 and $2 fish, but worthwhile for $400 fish.

Most aquarists I know (online) say they add dechlorinator *while* adding the water to the tank. Many add the dechlorinator to the tank, just before turning on the Python hose to fill the tank back up.

I used to add mine to the bucket, just before pouring in. Now I'm switching to a Python hose so I'll add it to the tank as I fill.
 
So far so good in my tanks. I just add Wardley's Chlorout right before adding the tap water, swish it around in the bucket and add the water to the tank.
 
I got a couple of 5 gallon buckets from Home Depot for a few bucks each. I add the dechlorinator (Amquel) while I'm filling them and then let them sit for about half an hour, more to let them outgas a bit then because of any concern about the Amquel. No troubles so far. As was noted above, many Python owners add the sauce straight into the tank while filling straight from the tap.

Two 5 gallon buckets about two thirds full should do the trick.

This is a new tank, currently cycling fishy? If so I'd follow OrionGirl's small regular changes regimen. If its an older established tank going through a crisis period, Anonapersona had some good things to say…
 
AquariaCentral.com