How to maintain water quality in a Betta tank

[Rivera1]

I have colored gravel. Could that be the problem?

could be. some of that stuff leaches weird chemicals. if you can, swap it out for something more natural. your fish'll thank you.

[finchly]

I switched to sand last year, and my water's been way more stable. Plus, it's easier to clean. Just siphon the surface during water changes.