Do more water changes.... That is if you have the time...I've got a Henlei pair as we'll but i had to take them to my bro in laws 400 because I couldn't keep my params good.
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I've upped mine to 30 to 40% wc every 3rd day...
Sometimes every 5 days if I'm too busy..
I wouldn't worry unless your fish started acting out of the ordinary or showing signs of stress
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