blind fish?

Hi,
I have a young fish approx 7-8 cm that is slightly dark in colour. It slowly swims around the tank bumping into whatever is in its way, plants, air lines, the glass etc.
Ph is 6.5 temp 30 all other parameters normal for geelong water.

Any thoughts?

Added a multi cure and a small quantity of salt after a water change.

Hi Nev.
Sorry to hear about your fish, it might have brain damage from accidentaly bumping into the glass or it could be very sick, maybe you should isolate it in a quarantine tank and add meds to make sure it has the best chance to recover, cheers.

Thanks for the reply.
Have put the fish out of its misery.

best thing for it mate I've had a couple of fish go the same way there is no cure.