Hey i'm a new betta owner and I got my betta Roy 5 days ago and today I noticed that little bits of his fin were missing. Not sure whether it was ripped or he nipped at it but I did a water 50% water change 2 days ago because white algae was growing on the driftwood and yesterday I added charcoal to the filter. do you think that could have stressed him out? He's in a 3 gallon tank with a java fern and small gravel. His fins were fine the day before when i made him flare for photos. What can I do to make his fin heal quickly? 
First 2 photos are from the day before and last 2 are from just now.
First 2 photos are from the day before and last 2 are from just now.
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