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Granulated Ferric Oxide, it's used to lower and control phosphates by running your tank water through a reactor with an amount that gives you the result you want.
I'm always happy to see them out there and happier when they keep me on my toes by random inspections. They are the ones who will still come and help when everyone else is afraid.
I did this with a 10 gallon tank with the kids. Each time we went to the beach we brought home something. We have a fine collection on snails, hermits, a mole crab, clam and a killifish. The kids love it.
Double sided Velcro for cable mgmt it's reusable and simple to rework if needed. If you don't want to/can't use screws, use the 3m line of products to hang your cabling.
If there is a way to prevent it from getting sucked in like using a prefilter type foam or mesh or pantyhose, I would do that. I would not turn off the power heads if possible.
When I uncovered my tank I saw my RBTA next to my return then realized it had split and I now have 2.
I covered mine and had my BP reactor off. But that's how I did it, it's not to say how you should do yours. After the 3 days I did a big water change for safe measure.