You won't see an ammonia spike. The nuisance organisms are very opportunistic and use it up before you can measure it. The green water is your indication of excess ammonia, caused by a dirty tank with lots of decaying material, as evidenced in your previous pictures.
Just keep up with the cleaning and eventually it will go away, then try not to let your tank get so dirty...
This is quite a rarity in tanks (as opposed to ponds) unless youíre tampering with carbon dioxide and nutrient levels, but it can still strike out of the blue.
The cause is a unicellular alga that lives free in the water, too small to get trapped in filters, and too persistent to be diluted out with a simple water change or two.
Ammonia is implicated in causing and sustaining green water, and stirring up substrates, subsequently releasing ammonia in to the water, can be a trigger. Off the shelf algaecides may help, water changes do very little, and my own experiences have found that a temporary black out where lights are turned off and the tank shrouded to keep out any external light will help reduce it, but not always eradicate it.
To add to the frustration, it will often disappear in a day or two entirely on its own."