Hi, Well i finally got everything right and i am starting to think its my fault and that i may have been over feeding , i came to this conclusion after 3 of my large fish died.I did the dsily water changes and now are doing weekly....The oscar is soooo messy......and all the others are fine now thanks to this forum.... But can some one tell me the right amount of food to feed I have 140 gallon tank .....1 large oscar a salmon catfish 2 small silver sharks an angel and 5 gouramis and also a clown loach i usuall feed bloodworms and a beef mix as well not sure whats in it it comes in small frozen blocks evryone seems to say something different and i feel this is creating bad water conditions and also how often should i feed them PLEASE HELP.and also pellets( sorry) 
