The fish should be fine with just get airpump till Wed .. You can even stir the surface for more oxygen exchange. The bigger concern will be keeping your BB alive ... It'll be important to keep your filter media wet with tank water and keeping your water temp stable.
Are you going through summer or winter? (members in the southern hemisphere)
75g Planted Barbs Denison, BlackRuby, Tiger, Albino Tiger, Green Tiger, Cherry, Gold, Checkered, Odessa.
NonBarbs Cardinal, Neon, RummyNose, Bloodfin Tetras, Z. Danios. 1RTS. Amano, Bamboo, Ghost & RCS. 20g Long Shrimp Tank RCS, Tiger, Amano.