I joined this site seeking advice. Im very new to this hobby. My yellow tang and clown died within 3 weeks of bringing them home and I don't understand because I did everything by the book. I attached a picture of the tank
My setup is a 10 gallon tank with 10 pounds of live rock and live sand. Fluval canister filter. small Powerhead. and heater I used ro
water, let the tank fully cycle before adding any fish. throughout the 3 weeks my fish were alive, my water parameters stayed great. ammonia 0. Nitrites 0. nitrates 20. PH 8. Salinity 1.021. temperature 81F. I used no meds. fed 2 twice daily, being careful no to over feed.
I drip acclimated the fish when I got them. I did not quarantine. they ate fine for first 2 weeks and acted normal. the clown one day had a small cut on his side and was acting strange. no white spots that I could see. eventually he quit eating and one day his cut had a purple band around it then he dead next day. found him wedged under a rock. The tang also started acting weird, not eating, also he looked pale over his whole body. no white spots or fin rot, eyes were clear. he was dead this morning. I also have 2 hermit crabs and a peppermint shrimp. all seem to be doing fine.
any ideas what I did wrong.