What will you be using the tank for? Given its very small size, you don't need to cycle to 4ppm; 2ppm should be plenty.
To ensure you have sufficient bacteria, the idea is to dose to your chosen level (2ppm), wait for ammonia to drop to near 0 then redose., testing for ammonia an nitrite every 24 hours. When you get t the sage where the 2ppm of ammonia has reduced to 0 ammonia and 0 nitrite after 24 hours, continue daily dosing, but test after 12 hours. When the ammonia and subsequent nitrite are both being processed in 12 hours (i.e. 0 reading for both, 12 hours after adding ammonia), the tank is cycled.
I was hoping to put a dwarf puffer in it but I just want to give up. My goldies tank who I reported all well yesterday is now showing nitrite after this evenings test. I've done a big water change and not fed them tonight
Also noticed flounders lump has flared up which must be down to the nitrite. Bloody buggar #OOPS#.
So it's back to daily water changes for me and the puffer will just have to stay a dream for now. I'm not doing anything else until my lovely fish I have right now are sorted.