HELP! Algea, and O2 problems

[lionfish99]

Ok I need help. My tank currently is about 6 months old. already cycled for about 1.5 to 2 months. I added in my anemone and my feather duster about 2 weeks ago, and last wednesday I added snails, hermits, alittle bit of macro algea, and 2 pepermint shrimp. in the las couple of days my sand has been turning a brown color, as well as most rocks! also bubbles are comeing from the sand. If you move some sand alot bubbles go up I don't know what could be going on fish were suppose to be tomarrow but I'm delaying that now please help!

 

[fedukeford]

im pretty new at this but heres my advice.....i have a 55 gallon tank and one day the sand was pure mud color ...i just bought 2 hermit crabs and it wasa all gone by 2 days!! just get more hermit crabs and theyll do the job.. or get some type or algea eating fish

 

[lionfish99]

what kind of hermits? and what about the excessive oxygen!
The only thought I could come up with is because I have no fish i'm producing more oxygen than I'm using (possible?)

 

[lionfish99]

bump