My advice - Skip te fluid - See this
https://www.youtube.com/watch?v=G5uQQNsAYVU
You can buff or replace the lexan face. If need be by a clear PVC pipe from McMaster Carr and replace tubes but before you do that buy a cheap color flashing LED tape and some colored see thru pencil cases at an office depot type store. Cut the cases. Make cylinders, place inside tubes. Make 3-5 coils of tape and insert in each cylinder. Where old light got power attach female extension cord receptacle. Plug in LED light strip program as desired. No more PITA fluids and air pumps. LED strip lasts year. If it goes bad plug in another.