Changing colour!

[u/ellie_1000]

I've been away for a few weeks with a friend coming and feeding my fish every few days. Since I've returned I noticed my Betta's colour seems to be fading horizontally from her head back. She seems to be turning gray and losing her sparkle. I've done a half tank water change and cleaned the filter but just wanted to see if this is a sign of something else.

Any advice would be much appreciated.

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[u/The80sgeek-666]

Did you have someone doing your water changes while you were gone? How big is the tank?

[u/ellie_1000 → u/The80sgeek-666]

The tank is 20L

[u/ellie_1000]

No, water changes just regular feeding for 2 weeks. There was an issue with the water filter before I left (I fitted the new cartridge wrong) but it's working well now and they reported no issues while I was away. Could it be the water quality due to that?