greetings all I'll keep this short. new to this forum of course and hoping to come up with some answers. once I dig around a bit more I might even see something that fits into explaining my little problem. I've had 2 salt water aquariums so far (first was 18 gallons with a 3 gallon canister filter) and this time I've gone smaller with a 10 gallon self contained. my water quality looks good with ammonia, nitrates and nitrites all very close to zero. PH was off slightly and salinity was in the lower end of the acceptable range. last water change was about a month ago, 2 weeks ago one fish (6 line wrasse) and 3 days ago my cardinal died. No fish left. :( I'm just here for (hopefully) new avenues to figure it out. the woman at the local petco suggested excess food (in any quantity) plus the full spectrum lighting in my tank has caused an algae to bloom/die off rapidly causing fluctuations in tank quality....