Ammonia Question During Fishless Cycle

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Hi all, new member seeking some guidance.

I've set up a 150 litre new tank from scratch and I'm 10 days into a fish-less cycle.

Some basic info:

150 litre tank
1,150 l/per hr canister filter
7.2 pH
6 dH GH
4 dH KH
No plants yet
Cycle temp 30 dC
Ammonia source - Waterlife (SeAquariums) Bio-Mature

My questions is - how often should I be adding the ammonia?

The reason I ask is that by following the instructions to achieve 5 mg/l, by adding he correct amount once a day, after a couple of days, the ammonia level was dropping back to zero within a a few hours.

This went on a few days but the nitrites failed to increase above 0.1 mg/l.

I am assuming this is due to high capacity filtration I have?

To combat this, I'm having to add ammonia to the tank at least twice a day to stop the ammonia reaching zero, which after a few days, I'm finally seeing the nitrites starting to rise, which I guess is good news.

Nitrates are still similar to tap water, so I know I'm still only at the second stage.

Am I correct to keep the ammonia at or close to 5 mg/l until after the nitrite spike has occurred?

It just seems like I'm adding an awful lot of ammonia just to keep the levels up as directed.

If I get the Ammonia to 5 mg/l and don't add any more, it will be zero within 6 hours and the nitrite then fails to rise.

Could do with some pointers as to bet practice to ensure a successful cycle.

Is my large filtration the reason for having to add so much ammonia to keep levels up?

Thanks in advance.
 
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Sorry, got my units confused, yes, 5ppm back to zero in a few hours.
Tested nitrite earlier and it's about the same at 5ppm.
Nitrates are beginning to rise at abut 50-75ppm now.

Is a single dose of ammonia per day sufficient until nitrites fall away, even though this means the ammonia level will be zero for about 18 hours a day?
 
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