Really concerned about my new guppy
For the last couple of hours he’s been swimming in one spot near the surface. We just got four guppies in a new tank by themselves yesterday and they’ve all been active and fine up until this. The others seem okay.
He was the first to really explore the tank and now he’s just up by the surface and I’m concerned there’s something wrong.
I just did a water test and all looks fine. Nitrates slightly on the high side so I’ve done a water change.
Does anyone recognise this behaviour? What can I do?