I know that this media works so well due to it's massive internal pore structure, but I also know that over time this must become clogged by dead bacteria, biofilm, and miscellaneous detritus in the water. Does EHEIM reccomend replacement at a certain interval, or is replacement something that's only a concern after a number of years? If so, how many years.
I've personally been running an EHEIM Ecco 2234 on a 29 gallon FW tank for 4 or 5 years now and I'm wondering if it would be wise to replace some of the bio-media as the lone-survivor of a heater malfunction (a red tail black shark) finally passed away not too long ago. I'm now looking into converting the tank to a brackish tank and housing a couple figure 8 puffers. But stories aside, should I replace the media or simply see how well it handles the bio-load? This is certainly not cheap filter media and I'd rather not replace any of it, but at the same time I want the fish to have the best environment possible.