I dont have experience with Kordon products but I do have experience with tetra aquasafe and safestart.
Regarding aquasafe its best to buy the pond version, the bottle is green rather than yellow. This version lasts a hell of a lot longer than the aquarium version as you use far less, great dechlorinator.
Tetra safestart I have always used when adding fish to my tanks, basically bacteria in a bottle.
I keep a spare bottle for any mini cycles or if I do larger than normal water changes.





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