Cat

Should the pump be set to filtration or circulation? and should both the skimmer and bottom valves be left open?

She is 6 years old. Vet said he would have assumed twice that! She has always carried her tail horizontally but now her back legs appear to be seizing up slightly. She can jump onto the sofa but has to manouvere herself to lie down She doesnt appear to be able to sit in the classic Egyptian cat pose and tips forward when going to toilet. Occasionally she opens mouth and it locks.Xrays show no spinal injury or deterioration.Comprehensive blood tests show a slightly raised sugar level(not high enough to be diabetes)a slightly raised globulin level(could indicate infection) liver and kidney function good. She hasnt got feline aids or leukemia. Blood pressure excellent. Anti inflammatory injection - no effect. Steroid injection - no effect (but did give her the sneezes for 3 days). Now on antibiotics but so far no effect. It isnt a blood clot. Next step is MRI scan but its all getting very expensive with no answers. She is happy in herself but gets very stressed going to vets. Any ideas?