Well they've finally gotten through 30 days of Cu (ended yesterday) and I started running a reactor with a mix of Cuprisorb and Rox 0.8 Carbon which is what I used on the other tank to get the Cu out. That said, this reactor now has been running over 24 hours and Cu level is still the same on the API Test (I was using CopperSafe). I know I have way more Cuprisorb being tumbled than needed for a 29G but it's not seeming to move the needle - any ideas? On the bright side, the water became crystal clear in less than 2 hours