Did you put the fish back in the tank with pure tap water?
You are suppossed to cycle the tank to get the water perimeters where they need to be prior to adding fish.
In the future you should just do a 20% water change while vacuuming the gravel out.
I'm still new that this so please correct me if I'm wrong.
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~Chris~
55g planted; 30g planted; 5g planted
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