HELP! Black mold/algae/mildew stuff

scottsdale454ss

New Member
Ok so first off im a newb, i just started my tank about 3 weeks ago. Whats this black stuff????

i bought some premium liverock from a place going out of business last week. The guy told me the rock had been in his tub for a few weeks already, and when i smelled it it didnt have any strong odors. I noticed the last few days that my tank had a strong fishy smell, but i figured maybe thats normal?? Well today while trying to catch a hitchhiker crab, i took the rock out of the water and noticed this black stuff on the bottom of the rock where it sits in the sand and i also noticed that the rock stinks alot more than it did before.

upon further inspection of the tank, i noticed some of my other liverock (the more normal fully cured stuff) also has some black stuff on the bottom of it. and when i look through the glass at the sand i can see some black stuff beneath the sand.

Should i be worried? What should i do?

http://i790.photobucket.com/albums/yy18 ... fsmall.jpg

http://i790.photobucket.com/albums/yy18 ... ksmall.jpg
 
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