wtf

Hey all, Found this really scary thing in my sand bed. Can anyone identify? It looks like a worm of some sort. The main body (left) was under the sand. The tentacles on the right are the things I see above the sand moving around looking for food. The red thing on the right is a blood worm...

Just started my refugium about two weeks ago - still new to the critters to expect. Found this guy marching around down there. Probably a good half inch long not including the whiskers. So are amphipods normally this big, if that is indeed what this is??? I guess he hitchhiked on a ball of...

ok my nitrate is at 20, my nitrite is at 0, my ammonia is at like .05,my ph is like 8.2 and my specific gravity is 1.023. My anemone looks horrable. its all scragally and stuff. my fish seem fine i have a lawnmower blenny, a twin spot golby, a green spot puffer,a six line wasse,a hawian feather...