Hello, imtai.
Thank you for sharing your shrimp tank setup.
I've just tricked you into making a commitment by starting this thread. Now you'll have to keep updating it and learn based on feedbacks from everyone here.
Anyway, regarding your question about why your tank took very long to cycle, I think you already have a pretty good idea what could have been the cause. I believe there's nothing wrong with your choice of substrate. Many shrimpers here uses soil because it will help to buffer the pH of your tank water among other things.
The only problem was, you weren't aware that active soil like the one you used will release lots of nutrients initially and you shouldn't need to add fish food to start the cycle. Then again, even without the fish food that you added, the time it took to cycle your tank might have taken just as long. Different active soils do contain different composition.
For example, a tank that uses ADA Amazonia soil is known for taking a very long time to cycle. That's because it releases lots of nutrients initially but that's a good thing; if you're doing a heavily planted tank. The Q&A for the H.E.L.P Advanced Soil Shrimp did mention that it does not contain any nutrients for plants but does contain humic acids which are meant for shrimps.
Anyway, I noticed that your tank is almost cycled and you should be able to go get your shrimps soon. Keep us updated, alright?
Good luck!
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