hi everyone im having a issue with all my fishies dying.... anyhow had my system running for about 4months now only had fish for about 2 months... finished the nitrogen cycle... 75g tank with 20g sump.. added 2 baby tank raised nemos a cleaner wrasse and a yellow wrasse... everything good for first 3 -4 weeks then cleaner wrasse dies.... check amonia nitrite and nitrate all fine.... buy another wrasse. a Melanurus Wrasse hes cool for about a week... took back one of the clowns couse they allmost same size as each other and starting to pick at each other a lot i guess to figure out who dominate one is.. around that time started noticing white spots on melanurus so figured ich... didnt have a quarentine tank so i just hoped for the best a week later hes gone.... few days go by and yellow wrasse bit the dust no white spots on him but when i took back the clown i got some big emerald crabs couse i was afraid if they to small the melanurus would kill them... next day after the yellow wrasse gone my clown dead... clown and yellow seemed fine till dead... also noticed emeralds eating dead fish... so is it possible my emeralds are killing my small fish or is it just ich killed them with no noticable symptoms... salinity 1.023 heat78.4f nitrite and amonia 0ppm nitrate 5ppm? is 5ppm high for a fish only tank? also got a top off system for stable salinity but unfortinatlly that came after dead fish....and i know shoulda had a QT tank...........