Im sorry bettagirl
Just out of curiosity, are the red stripes disappearing? There is something called Neon Tetra Disease with is pretty deadly and thats a sign.
Taken from fish-diseases.com: "Pleistophora is also called Neon Tetra Disease because of its high prevalence among Neon Tetras, although it has also been reported to infect most Characins, Cichlids, Cyprinids (i.e., danios), and all the carp-like fishes. It is characterized by a loss of coloration and pale, white patches of skin, particularly the strip of skin beneath the dorsal fin. Other symptoms may include spinal curvature, emaciation, fin deterioration and erratic swimming behavior."
It generally doesn't hit loaches tho. I'd keep up those water changes in case its toxin based (ammonia/nitrite). Chance are your tank is cycling. The nitrifying bacteria don't live in the water, they live on surfaces like the filter n walls. You may have drastically reduced the colony when you moved. That combined with the antibiotics may have done it in, causing high ammonia/nitrite levels. Both are deadly. I strongly recommend getting those levels tested asap
Changes in water temp also stress the heck out of fish (which can lead to disease). Better to have a highish temp then to drop it quickly. You're guys have had a rough time
for future reference, if the tank temps really spike, blow a fan over the water. It'll cool it down, but not too quickly (remember evaporation and cooling from school? LOL
neither do I, but I looked it up).