Pleural effusion is an abnormal buildup of fluid up in the pleural cavity, the thin fluid-filled space that lies between the lungs and the chest wall. It is a symptom, with an underlying disorder causing this fluid to build up. The buildup of excess fluid leads to difficulty breathing, due to the inability of the lungs to fully expand. Causes include congestive heart failure, liver failure, fluid overload, blood clotting disorders (usually due to ingestion of rat poison), lung lobe torsion, pulmonary edema, and diaphragmatic hernia.
Calico: Separate solid blocks of color, which must include red (orange), black, and white. They also may have blocks of tabby pattern, which produces an extremely colorful and beautiful cat. Dilute calicos, have the same separate blocks of color, only the colors are "diluted," i.e. "faded" shades of the original, which gives them an ethereal appearance. A dilute calico will have pale orange or buff for the red, and gray (or "blue") for the black.
Without examining Midnight it is difficult to give a diagnosis since lethargy and loss of appetite are vague symptoms common with many different conditions; infections, parasites (regardless of indoor or not), foreign objects, poisoning, spoiled food, injury (fell from somewhere) among many other causes may lead to these symptoms. You should ensure that Midnight is kept hydrated, but if there is no improvement you should visit your Veterinarian for an examination. Regards Dr Callum Turner DVM 

Class clown — there’s always one! Purina notes that these confident and friendly creatures stand out because of their clowning around. These short-tailed cats, who were bred in the U.S. starting in the 1960s, according to TICA, make a great family pet since they’re sociable with humans of all ages and even other friends of the four-legged variety. They’re all about fun — but aren’t in need of your undivided attention — and don’t tend to attach themselves to one person.  
If your cat is struggling to breath and is not eating or moving, it could be a sign of trauma in cats. A steep fall, collision or dog attack can result in internal injuries, which can affect your cats lung capacity. An internal hemorrhage, intense pain, fractures or pneumothorax constitute as emergencies that can cause fast, superficial abdominal breathing in cats.
There are a few possible causes of rapid breathing or increased respiration rate in cats which may be due to allergies, infection, foreign objects, sign of pain, other pulmonary problems among other issues. It is important that any serious causes or ruled out or treated, it would be best to have your Veterinarian give Darcy a check up to be on the safe side on your next visit as 80 breaths per minute is around double the physiological range. Regards Dr Callum Turner DVM www.vet.cornell.edu/fhc/Health_Information/dyspnea.cfm
There are a few possible causes of rapid breathing or increased respiration rate in cats which may be due to allergies, infection, foreign objects, sign of pain, other pulmonary problems among other issues. It is important that any serious causes or ruled out or treated, it would be best to have your Veterinarian give Darcy a check up to be on the safe side on your next visit as 80 breaths per minute is around double the physiological range. Regards Dr Callum Turner DVM www.vet.cornell.edu/fhc/Health_Information/dyspnea.cfm
Rapid breathing (tachypnea) is a respiratory disorder characterised by abnormal breathing that is rapid and shallow.  It is caused by a reduced level of oxygen, mechanical disorders (where the lungs aren’t able to expand as they should, usually due to a build-up of fluid in or around the lungs), and physiological disorders in which the cat’s respiratory centre in the brain is over stimulated.
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