Yes that will work. those are expanded clay pellets that have been kilned and heated. I used them extensively in hydroponics and aquaponics setups. They are very porous, enough so that they float before becoming waterlogged. I have seen setups where the fish live in a reservoir, then a pump pushes water through a bed of these clay pellets (I prefer hydroton brand) that acts as the biological media for the tilapia and rooting substrate for kale, and other veggies. symbiotic system works great.
It's cheap, and quite porous, more so than even lavarock. This is a quality, budget media that is a decent compromise. Just make sure you rinse the heck out of it. I find when using it as hydroponic medium that if I rinse bags thoroughly with hose water, then put into pots and add pure RO (20ppm) the ppm rises to about 550 overnight and ph rises. I have to rinse with pure ro 2/3 times to leach all of the salts out of the pellets. be aware of this and rinse it a ridiculous amount. Once properly rinsed and leached of salts it's a fairly inert medium that is safe for fish.
It's cheap, and quite porous, more so than even lavarock. This is a quality, budget media that is a decent compromise. Just make sure you rinse the heck out of it. I find when using it as hydroponic medium that if I rinse bags thoroughly with hose water, then put into pots and add pure RO (20ppm) the ppm rises to about 550 overnight and ph rises. I have to rinse with pure ro 2/3 times to leach all of the salts out of the pellets. be aware of this and rinse it a ridiculous amount. Once properly rinsed and leached of salts it's a fairly inert medium that is safe for fish.
