Tracking of WaterChange Intervall and Coal-Filtering

[StefanSchubert]

Is your feature request related to a problem? Please describe.
The third time I have an Euphylia now. This time it looked that I could keep here. But unfortunately she is retreating since 3 weeks and her coral tissue melted meanwhile so much that the skeleton becomes visible. Again I fear it is too late to rescue that coral. I switched from manual to automatic dosing of Ca and KH and my water parameter seemed to be OK, so what could be the cause?!

I also feed the coral, with phytoplankton to make it grow, but this remedy doesn't show any effect.
I observed that other corals like my caulestrae and some dish anemones are spreading very well, also kenia trees.

Due to too much work at my job I became a lazy reefer of my nano-reef (80 Liters).
Meanwhile I believe that because I does't cycle sea-water and just add water and (Ca/KH) Supplements, that the concentration of nettle toxin has become too much and causes the retreat of the Euphylia.

I started no to do coal based filtering to reduce the nettle toxin (which amount can't be measured through water tests).

Describe the solution you'd like
To confirm the possible cause we would require to collect the following parameters for the tanks:

1. How often du you change water and to which percentage?
2. Do you rely completely on water exchange or du you add supplements (which ones, how often)
3. Do you do any coal filtering (if so steady, or as interval? how often)

Describe alternatives you've considered
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Additional context
Add any other context or screenshots about the feature request here.
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