I know I've posted before about algae problems, but now it's driving me nuts. I have what looks like caulerpa growing in my tank. It looks like little green feathers growing everywhere. I have since gotten an emrald crab (as you know I hate crabs) so I'm at my wits end with the algae. I don't overfeed, and my tank isn't overpopulated (at least I don't think so). I started running phosguard again and it seems to be making the problem worse. What could be causing the problem?? I know if you cut out phosphates then the problem will go away, but I can't seem to do it or find out what is causing it. In my 20 gallon tank I have a very small clarkii clown. he's probably 1.5" and a small bi-color blenny. I have a fire shrimp, an emrald crab, 5 astreas, 6 nassarius and 3 teeny conches. Do I have too many snails or something? I was told they aren't a problem for the bio-load. My params... the salinity is a bit high, around 1.026, nitrates,nitrites and amonia are all at zero. I run my calcium around 450. My temp stays constant around 80-82. I don't have any of the other tests so I don't know about them. Can someone give me advice? Thanks!