[rlcline76]

Here is the thing about zoas. Water quality, light an flow will dictate health.
You need to work on your parameters. Both KH and Ca are low enough that you could try using a 2 part solution like Kents Tech cb.
Get some water changes going and ditch those bioballs if you want lower nitrates and up that salinity.
Try moving the zoas to a better lit area of the tank with good flow. If you notice any cheesy like appearance on the polyps that would suggest disease, not just an environmental problem, I have read that you will want to remove those from your tank completely.