As was mentioned, an intake sponge like that for the fluval edge would help(I use it in both my tanks). However, any healthy fish should more than easily be able to swim away from the intake. If their getting stuck, you either have a REDICULOUS filter that belongs in a pool or the fish is on it's death bed.
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.