hello all i baught a 180 gallon salt water fish tank today and its pretty new and the things i want to know about it is,it has 2 filter boxes atached to the back walls with 2 hozes in the bottom of each filter box so does anybody know what type of filter it is that i have to buy for it it looks like its pvc piping and my other question is is if i am able to change it to put my arowanas and clown knife fish into it or if ther anything i can buy to block up the 4 holes in the underneith. please let me kno if you kno anything about this it would be ALOT of help,Thank you,Aaron.. i have attached pics for you to see



