Yes, try the bleach/bucket thing. I think pH at 7.3 is OK, but if one of the metal experts reads this they can correct me if they think you should lower it a little more.

Yes to paying attention in chemistry class ---- (can you tell that I am a teacher!)

And a big NO, NO, NO, to draining the pool and never looking back!

You're gonna get this thing straightened out and will soon be enjoying this pool. And besides, who needs another planter??!!

Good luck.