BTA water levels

[kar93]

would alk, calcium and phosphate affect a BTA what would be the maximum levels of these that they would take

[seapug]

if they are "off" then they definitely could cause problems. All should be in line with standard reef params:

alk: 7-12 dkh
cal: 350-450
po4: 0

[kar93]

would 0.5 po4 affect it

[tgfrench]

It is possible that your po reading could be affecting it. If you have any sps in your tank, I believe you would first see stress among them before seeing any effects upon the bta.