recently i just bought 4 dwarf puffers.i bought life shrimp,dried worms n flakes to feed them.But somehow they dun wanna touch those kind of food n they keep runnin away when they saw me.all da food will end up suck by da filter pump.they diet about 5days d since da last time i fed them some snails i found at nearby moonsoon drain.Will they die if they didnt eat for too long???