Thought I'd share my first experience of draining a hen's abdomen and a question

Anna Mae is a 3 y.o. Red Sexlink hen.

Sunday evening I noticed that she was mopey, picking at her food, breathing thru her mouth, staying close to the coop and waddling. I picked her up and it was quite evident that her abdomen was filled with fluid (fluid was dripping from her vent). She survived the night and Monday morning I headed to the vet's office and for about $7 I picked up a 60 ml syringe with a 30 inch tube extension. On one end of the tube was the syringe and on the other end was an 18 gauge needle. The tube also had a plastic clamp on it. This turned out to be a "wonderful" set up as I didn't have to remove the needle to empty the syringe; I just clamped off the tube and removed the syringe from the tube to empty. I picked an area of Anna Mae's abdomen that had no visible veins; cleaned the area with an alcohol swab and inserted the needle only about 1/4". I ended up removing around 220 ml of fluid (poor girl) . I know that I'll need to continue to monitor Anna Mae and remove the fluid as necessary, however, although she's still moving gingerly, she seems to be a lot more comfortable and her appetite has picked up some.

As to my question. I had done some research on the use of an antibiotic in conjunction with the draining and it seems as if Baytril was the antibiotic of choice but there was caution on using Baytril? I ended up giving her .5 ml of Tylan 50 orally (will administer for 5 days). Should I switch to Penicillin?