Alright, for all you peeps that have carbon in your HOB filters, you know you have to change it once every 6 Months or so right? What happens to the bacteria? Well I hope this is a solution.
So for this project you'll need:
-rubber bands, AQ glue, or cable ties
Steps: cut two of the three straws into 5 cm segments. Then bind them together to form a cylinder of straws. Cut a 7-10 CM piece off the third straw and shove it in the middle of the cylinder. Put the piece into the filter and let sit for at least 1 month* to allow BB buildup. Pics belowThere should be no need to replace BB Medium unless there was a recent outbreak of disease. You can replace the cartridge without worrying about the tank's cycle!
*Note: I have not had this setup in my tank for more than 2 days by this time, so the times are educated guesses: estimates.
The last pic is the finished product!