Hello, new to the forum my name is Andrew nice to meet everyone. Unfortunately I joined cause I'm having a big problem, I believe my sand bed may be dying. I bought this tank used it had been running successfully for 4 years. I took everything from the old tank: fish, sails, live rock , water, and even the sand. I have had the tank set up for about 2 months and both of the peppermint shrimp just died within the same week and now I see the Halloween crab is dead. The sand it covered in black dots on the glass and most concerning is under the tank there is a huge black mass of sand. I'm sure I am not describing this well I am going to attach pictures if I can. I had the water tested 2 weeks ago at Petco everything was fine. But I just noticed the sand looking really bad today, probably started a day or 2 ago. P.s. 65 gallon tank with 15 gallon sump and protein skimmer. Currently 7 small fish 2 nano fish 6-7 snails 5 or so blue leg hermit crabs. Corals candy canes, brains, toadstool leather. p.p.s. I have a fish that kicks up sand from under the rocks so in some areas I see the glass bottom but in others the sand bed is about 4-5 inches deep. I just did a 20% water change. 1)The first picture from the top is a big black area because I decided to stick a pole into the sand because I was watching to much YouTube. 2) pic from under the tank right side cleaning looking sand. 3) what concerns me most pic from under the tank left side looks like death... ? 4)5)6) front of tank sand bed with n without flash tons of tiny black dots have formed recently but otherwise looks healthy to me? But I am no expert . Any advise is greatly appreciated. Thanks in advance
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