i bought a jar of Wardley tubifex worm cubes, and the directions say to "press the cube firmly against the side of your aquarium will below the water line......." well, i do that, and it doesn't stick... it will stick for maybe 30 seconds, and then it will fall off and float to the top (the whole cube)... so do you guys just drop a cube into the water and let it dissolve on the top and then sink to the bottom or what? last night, i squeezed it really hard while under the water (trying to make it stick to the glass), and it sank, and my cories and gouramis ate off of it for about 10 minutes... and then there was some that floated around in the water for however long it took to get eaten up by all my other fish or sucked into the filter... i'm just concerned about the stuff causing algae or diseases in the tank because it doesn't get eaten in time... should i just break the cube up and put a little piece in the tank? or leave it alone and go back to the tetramin flake food?