yep i think we all get like that from time to time...my dilema..friday before xmas..my son decides to drop a whole bottle of pepsi in my tank..sat afternoon tanks cloudy ( white ) so i jet on over to my lfs one i normally would put all faith in! he said " wow, seeing as some put sugar in their tank, i would think it would be ok" well guess what we went and did a small water change..sunday..still cloudy but looked like it was clearing up, of course changing carbon and filter pads..monday christmas eve and my 14 anniversary we come home 11 pm to a bunch of dead fish..3/4 of my corals shot...so from 11 to 2 am..mix emergency salt..take out all corals i could fit in the 10 gal..we..snails all dead ( another emergency water change but on the 10 gal..so doing a amm reading..( and we still dont understand why) the test came out " blue" go figure..any ways tues thru thurs ( by now i've had it..tear the dang thing down..and just walk away..with a amm reading than of 4.0..or higher, i hate the color charts! i go and buy new salt, water and do a 41 gal water change..bringing it down to 1.0 after 12 hours.. do another chage over the weekend bringing the amm down to .25 and than couple days ago no amm..trate or trite presant.. yesterday added what lived crabs..so far so good...its times like this you wonder if its really worth it..but once your addicted..your hooked for life!!