It cannot do much harm, due to the limitations and failsafes Neptune put on. It cannot set arbitrary values for your dosing and somehow crash the tank; it just modifies your daily amounts slightly from the default quantity you enter.
Firstly, the Trident relies on you KNOWING what your tank typically consumes. If you do not know this value from dosing regularly for a period of time (I would reccomend a few weeks), you should not set up trident controlled dosing.
For this example, your default dosing amount is 60 ml, and you ask the trident to maintain 8 dkh.
If there is any test below 7.6 dkh, it will send an ERROR notification and resume 60ml default dose.
If there is any test above 8.4dkh, it will send an ERROR notification and resume 60ml default dose.
No matter what, the adjustment range of the trident dosing is limited to ~ 25%. It cannot sustain your parameters with that default dosing amount +- 25% adjustment (Minimum 45ml, maximum 75ml) and values get out of range (below 7.6dkh or above 8.4dkh) , the ERROR notification will go off.
Pretty well thought out. I might be missing additional failsafes that it has. I have two Tridents running and it has been great- after moving to adjusted dosing, my parameter variation has decreased significantly.