What is Reddit's opinion of Aquarium Fish Tank Bottom Isolation, Grid Divider Tray Egg 4 Pcs (L 4pcs)?

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If you prefer a glass lid, Amazon has some glass lids you could purchase online, just check the dimensions. Otherwise I've seen some people do egg crate, like this or this. You can use plastic wrap. There's also such a thing called plastic canvas, which is similar to egg crate I think but a lil thinner and more flexible? I think, haven't used it personally, it's usually used to help with like sewing crafts.

As a quick tip, you can move the filter media from his previous tank's filter to his new filter to make sure you maintain the cycle. And make sure the fake plants aren't sharp, but if you're just reusing them and he hasn't had an issue yet it should be fine.

From your answers to the question, it seems like you don't have a water testing kit. By the time your parameters (high nitrates, presence of ammonia/nitrite) start affecting your fish, that is too late as that means it is already causing damage to your fish. I really recommend buying the API Freshwater Master Test kit. In my experience you can buy the kit for cheaper on Amazon than you would in-store.

Are talking like bungee netting? That's probably not so great.

Egg crate works well, it's a hard plastic.

ALEGI Aquarium Fish Tank Bottom Isolation 4 Pcs, Plastic Egg Crate Grid Divider Tray Egg https://www.amazon.com/dp/B097R7NKGB/ref=cm_sw_r_apan_i_T6VWGSW9NMARZEFZG0BQ

Aquarium plant mats work well

SLSON Aquarium Decorations Grass Artificial Plastic Lawn 9 inches Square Landscape Green Plants for Saltwater Freshwater Tropical Fish Tank Decoration,with 8 Pcs Suction Cups https://www.amazon.com/dp/B07C5Z4B5C/ref=cm_sw_r_apan_i_13C8PAS5YBQYBNHTVC6Y

Also stuff like coconut husk carpet

Ayybf Coco Liner,24x39.4 inch Wall Basket Planter Liner, Coco Liner Roll Hanging Basket Pad Garden Plants Wall Planter Flowerpot Basket Coco Fiber, Durable Coconut Husk for Planting. https://www.amazon.com/dp/B093LRTGBG/ref=cm_sw_r_apan_i_064DA5T187HA62CKXTXF

Cork is also another great one.

Fhiny 2 PCS Cork Terrarium Background, Natural Cork Bark Backdrop Tank Background Reptile Climbing Wall Terrarium Decor Accessories for Turtle Beared Dragon Chameleon Snake https://www.amazon.com/dp/B09KL7W7VP/ref=cm_sw_r_apan_i_9EAPV87AMVMY7KXXEQ0Y