Well, expect to treat, but if it shows no sign just QT and observe, only if it shows deflation then treat, but have cipro on hand and expecting to use, otherwise it's usually too late to order and begin after seeing signs, they drop fast.
2nd, you need a perch, fairly high up for light and best is so they can not touch anything, so it needs a wide berth.
Yes, high light and fairly good flow, very stable params that come w/ an established tank.
That's a mag in my avatar, that is about right, that mag never moved at all.