I just got my gar on Saturday, he's about 8-9" and he keeps swimming at the glass. I don't think it's normal but I figured I would check. I did a water change Saturday morning and as of yesterday night water parameters are perfect. My ph is around 8 though. The water temp is 80*. He's not running into it, basically just has his nose against it swimming back and forth like he's trying to get his reflection or something. He's in a 75g atm.
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