Either is fine. I use the compressed bricks and expand them because its easier to just squeeze the moisture out to the level if moisture you want than to add it to the pre-expanded stuff. Its more of a personal preference. I will say that the compressed bricks can be cheaper because sometimes you can find a pack of 3 bricks for $7.99 and the pre-expanded bags are usually $9.99 and have way less substrate in comparison.
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