Expired acropower

[Frogger]

I believe acro power is made up of mostly different nitrate compounds. I can't see nitrate compounds turning bad. Check the colour of the liquid if it is starting to turn green you could have come algae growing in it. Although the algae would be good for the tank.

However I could be wrong and there could be something else in there that could go bad.

[F.H]

Interesting okay thanks for the info.

The liquid is still clear with no smell or anything... I'm going to assume it's relatively safe to use still.