Looking on making a 1,000 to 2,000 gallon pond in my backyard to house some natives. I am going to try and make my own filter and I am looking for suggestions on what kind of homemade filter to make that works the best. Also I am looking on suggestions on what kind of pump to buy for this. I am thinking something that has at least 3,000 gpm since I will have at least two carp in there. Any suggestions or help on what to do or buy would be greatly apperciated I am a complete newbie to this.