temp usually stays around 80, has a heater to keep from going cold. my lights only change it 2 degrees.
no metals to speak of. i feed brine enriched with spirulina and sometimes flake. the onlything i added was i little strontium, calcium,iodine, and checked magnesium but did not add. i have clarkii, psuedochromis, yellow tang, scooter blenny, 2 blue chromis. the clarkii are quite young only about an 1.5" long. thabks for posting jacob.
i have really large (good kind) mythrax and have herd of the larger ones attacking fish. so that was just the thought on that.