If the pH is still high I would not use a glass container gunk from the rock lechate will cover the entire tank (at least this has happened with my curing bins and bath tub) and is a pain to clean. Use a rubbermaid tote or trashcan instead. The powerhead should be fine for circulation but it is more important that you do at minimum weekly waterchanges I would suggest daily wc's for the first week or two and then 2x a week till you read a pH of 8.6 or less a day after a 100% wc.
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And now back to my regularly scheduled lurking.
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