Exciting updates 😎
(especially for me as I’d somehow missed this topic for ages 😕 )
Most sponges are excellent homes for “filter bacteria”, even with weekly rinsing some will keep holding on 🙂
Pretty much anything in the filter flow will end up populated with various microorganisms, most filter companies will supply media designated as biological, mechanical etc and the different shapes makes it easy to decide which is which, some media is designed with maximum surface area (for theoretical bacteria to “attach”), while others are designed the trap debris etc
Similarly, bacteria etc will end up populating various surfaces (rock, wood, plants, soil, gravel etc) within the tank
Some surfaces are less efficient than others, eg, glass marbles (lots of inaccessible volume and little surface area, also “slippery”) vs Eheim Substrat (pro) (the rough crinkly surface means more surface area, significantly smaller internal volume than a larger smoother particle) etc
There are lovely electron micrographs showing all the pores available for microorganisms in various media (though I’ve not looked at this in ages ... perhaps they also have data indicating what’s where these days 😉 )
Obviously in planted tanks biomedia efficiency tends to be less critical than in fish only systems, and washing those “prefilter” sponges in tap or conditioned water is unlikely to make any difference
(especially for me as I’d somehow missed this topic for ages 😕 )
Most sponges are excellent homes for “filter bacteria”, even with weekly rinsing some will keep holding on 🙂
Pretty much anything in the filter flow will end up populated with various microorganisms, most filter companies will supply media designated as biological, mechanical etc and the different shapes makes it easy to decide which is which, some media is designed with maximum surface area (for theoretical bacteria to “attach”), while others are designed the trap debris etc
Similarly, bacteria etc will end up populating various surfaces (rock, wood, plants, soil, gravel etc) within the tank
Some surfaces are less efficient than others, eg, glass marbles (lots of inaccessible volume and little surface area, also “slippery”) vs Eheim Substrat (pro) (the rough crinkly surface means more surface area, significantly smaller internal volume than a larger smoother particle) etc
There are lovely electron micrographs showing all the pores available for microorganisms in various media (though I’ve not looked at this in ages ... perhaps they also have data indicating what’s where these days 😉 )
Obviously in planted tanks biomedia efficiency tends to be less critical than in fish only systems, and washing those “prefilter” sponges in tap or conditioned water is unlikely to make any difference