why discus swim at tank bottom?

[Honey]

Thanks for all the suggestions, everyone. Gonna check the filter flow and test the heater first. Appreciate the help!

Let us know what you find. Also, consider adding some tall plants if flow is the issue. Gives them breaks from the current.

[joshito]

Yep, plants help a ton. Mine love hiding in the valisneria when they wanna chill. Low tech plants work fine if you don't wanna mess with CO2.