Our platy has been pregnant for a while, and in the last few days has appeared more boxlike than ever before. She's been in the breeding tank for two days now and has yet to drop any fry and is now vertical. We need to know what to do ASAP. She doesn't seem to have much time left. HELP
That fish was never going to give birth in that box. Platies hate those little boxes, and will often refuse to give birth until they die. In the future, ditch the box and set up a little 5 gallon tank, full of plants, for birthing. You'll get much better results.