um well i had this nice new spike of brown algae...well it started to get darker and darker until it looked almost black and got really think all over my sand....so i did a water change...filtered the sand.....and walla should be good right? well now it is growing back and i don't know why....but this time it is a more reddish brown.....how do i get rid of this junk...OK and for some reason there is now alot of air in my tank. and i still cant get rid of that apastia...or whatever you call it....i tried to inject it with some white vinegar...but it goes to deep into the rock when i try to stab him.....there were three of them...now there are 8....any other suggestions?