bio balls

This topic has probably been beaten to death but I have a very particular question. On the Lowes website they have a product called Red Lava Rock and here is the link. https://www.lowes.com/pd/Kolor-Scape-0-5-cu-Ft-Red-Lava-Rock/50040758 My question is the following, is this a crushed version...

Hey guys I have a doubt about how I can make some bio media for my sump when I don't have enough money to buy the whole bio media. Do you guys have any idea on how I can make one as I have some very porous stone at this point and I wanted to make it into bio media. Is it fine to do so?

I know this could possibly start a big debate but that is what i need. In your opinion, what is the best non-commercial biological filter media? ie. lava rock pot scrubbers? I need a ton of it like enough to fill a 50 gallon drum worth. what is the best and dont cost an arm and a leg?

So I got my new tank, 55 gallon. Got 2 new filters for it.. 2 canisters, cascade 1000's 1 without filter media, (only bio balls) in every slot 25. second with filter pads, sponges, etc. etc. ( NO CARBON ) Prepped all rocks, for the tank.. Put them in a tub with Baking soda for 3 days, after...

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