my name is chris and im new to the site and would like to introduce my self and let u know about my fish i live in iowa. i am 22 years old and have ben keeping fish since i was 10 ive kept pirhanas for about a year now and could not be happier i recently set up a 20 galon salt tank and was wondering what kind of fish to put in it ? i also have 2 pictis cats and an albino channal cat an oscar a spotted puffer and a syndontis lace cat a jack dempsy and a few small tropical fish i am wanting to build a 900 gallon tank so i can get an arowna and some birchirs to put in with my oscar and some large red tails but need som advice on a filtration system and building materials.so that is all about me and my love for the hobby sorry life style.