Dead Zones

[spetitti]

Can someone, anyone, instruct me how to check for dead spots in the tank. I have a 20 gal with only 1 powerhead working at this time. I've only had this tank up running for about 3 months and I have an abundant amount of red slime growing but only on the bottom of the tank, on my sand bed. How do I check if that area is a dead zone, and what I can do to improve circulation.
Thanks!!
SP

 

[toosalty]

What I do is just use my finger, but if you wanna just watch the area for a minute go buy a cheap fake plastic plant or maybe some nylon rope and stick in in the area you think you have no flow. You should get your answer then.

 

[rebelprettyboy]

Id say add another powerhead and place it on the opposite side of the tank.
And TooSalty gave u an excellent way on how to check for dead spots.
And ur cyno could be coming from other things as well. Such as water quality and excess nutrients