These pellets are much larger than the ones we started with. These XL BioPellets do not need to be fitted in a fluidized reactor nor need to be fluidized. Due to the shape of the pellets they can be fitted perfectly in to a canister filter. This is ideal for the smaller plug and play aquariums where there is no space for a reactor, or aquariums without a sump. Also for larger systems this can be a benefit because you don’t lose space for the pellets to fluidize. You still need a high flow through the media
perfect in canister filters.
skimming is beneficial .