I would test your water before and after Prime then. It is good to know what is in the water before prime, but more importantly after, because that is what is actually going into your tank.
Yes you can grow macro in your display, read up on it going asexual first. I think Chaeto is one of the safer ones. Bev uses and elastic and attaches it to a rock in your BB tanks. I have just started Chaeto, but have had razor and grape calurpa in my display for a long time, never had any problems.
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