I don't know how big of a water change you do, but IMO 10-14 days is not often enough, I don't care what the fish are. How heavy is your bio-load? I do 75% changes weekly, more often if I have time (or the desire to do it). In my 150 I only have 4 fish totaling about 30 inches and running 3 cannister filters. Change a lot and change it a lot is a good motto to have your fish live by.I do regular changes every 10-14 days never had any issues all other tank mates are fine. Sometimes being a fish keeper is really stressful haha
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