totally valid input in my opinion
https://www.reef2reef.com/threads/t...ead-aka-one-against-many.230281/#post-2681445
that is a sand rinse thread where a few tanks have parted themselves to the core, rinsed, reassembled without a recycle. Its missing a direct answer to this post above (all just my opinions) and I will go edit it to mention adding new sand to existing. I would recommend evaluating the condition of the current sandbed before adding new. If your sandbed doesn't cloud if you reach in grab some, and drop it, then adding new sand equally rinsed will be neutral/inconsequential
in fact your beach sands will retain bacterial diversity per the first post in that thread and you'll be seeding your tank with beneficials even if you pre rinse that sand, you can't hardly make beach sand sterile unless you get chemically mean and peroxide isn't that bad at all. its a weak sterilizer due to the reasons mentioned in post 1
if you have a sandbed that does cloud, or shows invasion potential like cyano issues persisting or if it has black spots in it, then Id not recommend capping that off by adding back new sand. Id recommend fixing the whole sandbed existing, then adding any clean new sand along with that rinsed stuff you may want.
in the end all we're doing is analyzing where detritus is, and working to remove all of it not partial amounts.
Im not a fish guy, I have no idea if using natural sands violates fish QT protocols check w fish krew here. Rinsing is likely to remove parasitic animals and bac are most likely to be rinsed off last, but with the way they handle substrate isolations/fallow periods QT violation is a worthy confound to consider having nothing to do with actual sandbed dynamics otherwise
