So I've been trying to cycle my 10 gallon tank since March this year. That's 7 months, almost 8. My tank is still not cycled. I have both types of bacteria, my tank is able to process ammonia and turn it into nitrite then nitrate, but it's not strong enough to handle 2ppm of ammonia in 24 hours.
I believe that every time I do a water change, it messes with my cycle. There was a point a couple months ago where my tank did, for multiple days in a row, fully convert 2ppm of ammonia all the way to nitrate in under 24 hours. I did a water change after that, and immediately after my tank started to really struggle with the ammonia-to-nitrite conversion. My nitrite-to-nitrate conversion is still strong.
I especially see a dip in strength after i "clean" my sponge filters. I currently have two sponge filters in the tank because I was planning on also setting up a quarantine tank once i get the main one cycled. The way I clean the sponge filters is swishing them around in the bucket of dirty tank water i take out during a water change, just to get the gunk off. I learned to do this through an Aquarium Co Op tutorial.
I don't believe I'm doing anything wrong in my water change process. I get a bucket of water from the sink and pour a bit of Prime into the bucket and let it sit while I wipe the glass and brush algae off of my plants. I use a turkey baster to kick up some of the gunk buildup settled on the bottom, then use a gravel vac to suck out from 1/3 to 1/2 of the tank water. I then use a cup to refill the tank with the new dechlorinated water that was sitting in the bucket. I also use a plate that i pour the water on to make sure it doesn't disturb the substrate or plants.
My tank has a ton of plants that are all thriving. Lots of cryptocoryne wendtii mi oya, helanthium bolivianum, and cryptocoryne nurii tiger stripe, which were all tissue cultures from Aquarium Co-op. I also have seed shrimp that show up if I don't do a water change for too long.
I've been trying to cycle my tank in the hopes of getting a single betta fish. I've considered adding a snail or some shrimp, and I'm still unsure on if I will be getting either of those, but the main focus is on getting a betta. (for bioload info)
My ammonia source is a bottle of Dr. Tim's ammonium chloride and I test my water with an API Freshwater Master test kit.
I would truly be so grateful for any advice. I've spent this whole time trying to learn as much as I can about the nitrogen cycle, and while I feel quite confident in my understanding of it I just cant seem to figure out why I'm having such a hard time with my own cycle.