Originally Posted by Vpaw
I have a 20 gallon and a 29 gallon. My 29 has goldfish, so I see why there's ammonia but my 20 is mostly guppies. I have a gravel vaccum and it works great with the gravel in the 29 but I recently changed my 20 to sand. It is titanium moon sand and the vacuum doesn't seem to suck up the poop... But I'm working with that. I heard that anymore than 35% water change is dangerous. Also I don't have that much water, I'd have to go to the store a lot more to get more. I use spring water from water and ice.
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There's nothing dangerous about changing water over any certain amount unless you water in the tank is really fowled. Then you need to do multiple small water changes over the course of a couple of days. If you keep it clean from the get go then larger water changes are fine. I do 50% water changes in all my tanks every week.
May I ask why spring water and not tap water??