Most effective biofilter media by size?
As the number of snails in my 7.5g approaches twenty, plus three species of shrimp, so grows my concern about outstripping the capacity of the natural biofilters. In my Ovation filter, I have room for perhaps three layers of Eheim Substrat Pro which I have left over from earlier; it's not much space but all that's available. Is there anything that's significantly more effective and that could be reasonably sourced in small quantities?
I've heard good things about K2, for example, but believe it would likely float up into the unprotected impeller.
On reflection, I could also remove the black filter block that guards the intakes from incoming baby shrimp and use that space for even more filter materials. I already have a guard of the same black filter material surrounding the external intake ports around that block and fine filter floss near the impeller, so that shouldn't seriously degrade protection. There would be no issue with floating materials there; in fact, that would probably be preferable to the weight of the Substrat Pro threatening to blow off the lower access door and spill it all over the bottom of the tank.
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