I have 2 Azureus PDFs now in a tall 20g. I used to have 3 but one passed away awhile ago. Now another one looks like it is about to pass. Just like the last, this one isnt eating much, moving slow, today it isnt moving at all. I dont think it will last the night . I watched it for awhile and it looked like it was having a seizure or something . I tested the water, everything is ok. Im not sure what to do, I feel so helpless.