I'll put a recipie together for you that should work on all 3 tanks as they stand currently.
Choose a time of day as your add hour.
Each day at this time each day test pH.
If pH is less than 6 - massive water change.
If not add 3ppm ammonia (if tank can clear 3ppm in 24 hours to double zeros - increase to 5ppm)
12 hours after adding ammonia - test ammonia and nitrite - if double zeros yay! if not not long now.
Repeat these steps each day until you get double zeros 12 hours after adding ammonia.
Only add ammonia once per 24 hours at the same time each day.
Make sure you are dosing the full 5ppm towards the end of the cycle.
Once you get double zeros keep adding 5ppm every 24 hours for 1 week and make sure it clears in 12 hours.
Tank cycling 5ppm every 12 hours for 1 week = fish time.
Choose a time of day as your add hour.
Each day at this time each day test pH.
If pH is less than 6 - massive water change.
If not add 3ppm ammonia (if tank can clear 3ppm in 24 hours to double zeros - increase to 5ppm)
12 hours after adding ammonia - test ammonia and nitrite - if double zeros yay! if not not long now.
Repeat these steps each day until you get double zeros 12 hours after adding ammonia.
Only add ammonia once per 24 hours at the same time each day.
Make sure you are dosing the full 5ppm towards the end of the cycle.
Once you get double zeros keep adding 5ppm every 24 hours for 1 week and make sure it clears in 12 hours.
Tank cycling 5ppm every 12 hours for 1 week = fish time.