Previously, I did a fishless cycle on this tank which took a grand total of one month. This time, I switched from the Powerbio 700 by Classica to a Elite Mini (a tiny internal filter which is quite efficient and was a favourite of mine for my fish room) which I “seeded” with cycled filter media from my display tank. I had also switched the heater from the 50 W heater that came with the tank to a Visitherm 50 W heater which was also salvaged from when I broke down by fish room five years ago. This puts the heater and the filter both at around 7-9 years old and still in perfect working order.
To seed a new filter, some of the new filter media needs to be replaced with old, cycled filter media which already has all the necessary bacteria living on it. It is possible for a filter to be partially seeded, to kick start the cycle with household ammonia or for low stocking, or to be fully seeding so that it will be able to take closer to full stock immediately. If you are seeing your filter and aiming for higher stocking, I recommend that the seeding is followed by a fishless cycle, which should take no more than a week or so.
I drip acclimatised the fish as normal and set up the filter at the same time on the 13th of December. Ammonia and nitrite have been at a constant 0 ppm since then, which means that seeding followed by immediate low stocking works well.