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Anonymous
so i have a 36 gallon piranha tank with 3 bucktooth tetras 5 piranha and 1 sucker fish i haven't cleaned it for like 2 weeks and last time i did clean it it was more then 50 percent water exchange the water looks fine but someone told me to clean it once a week

are my fish going to die from like poop content in the water if i don't clean it every week?
>> Anonymous
It's suggested that you change 10% of the water every week or 20% every other week. This is more so for smaller tanks that have less stable ecosystems. I do water changes in my two 10 gallons and my 20 gallon every 2 or 3 weeks and my fish seem pretty healthy.