See this for info #s 460 ,464 & 4606 - start with 4606.
https://srac.tamu.edu/index.cfm/CategoryDetails/whichcategory/25/Calcium and magnesium are essential
in the biological processes
of fish (bone and scale formation,
blood clotting and other metabolic
reactions). Fish can absorb calcium
and magnesium directly
from the water or from food.
However, calcium is the most important
environmental, divalent
salt in fish culture water. The presence
of free (ionic), calcium in culture
water helps reduce the loss of
other salts (e.g., sodium and potassium)
from fish body fluids (i.e.,
blood). Sodium and potassium
are the most important salts in fish
blood and are critical for normal
heart, nerve and muscle function.
Research has shown that environmental
calcium is also required to
re-absorb these lost salts. In low
calcium water, fish can lose (leak)
substantial quantities of sodium
and potassium into the water.
Ag lime is the best option.
Sometimes it will help clear the water. I usually try that in situations like yours before I move on to other options.
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