I didn't say the aloe was bad, I'm just not familiar with it in fishkeeping. As for the brand, whatever you can get near you, seachem is often mentioned on here, but any dechlorinater. you just need to get the chlorine out of the tap water. Over the years I've used tetra brand, api, seachem, etc.
As for dosing, you said your dosing for how much water you remove, which is fine, but you didn't say when you treat the water. if your putting the conditioner directly into the tank then you need to dose for the whole tank volume. If you put the conditioner into the bucket with the tap water then you only dose the bucket amount. As mentioned above, overdosing on water conditioner is pretty harmless, but the dechlorinater reduces oxygen in the water, so don't go too crazy. And it's a good idea to have an airstone running, or some sort of surface agitation, usually pouring a bucket in creates a lot of agitation which helps.