hi i currently have a 50 gallon tank and all i had in there was 6 neon tetras.. i went to the LFS and baught 6 black neon tetras and 4 flame tetras now there is only 1 flame tetra and 3 black neon tetras the rest where stuck to the filter intake.. i have no ammonia or nitrites the tank has been running for about a month with the tetras and i havent had any problems.. can anyone help?