I am going to finally build a pond at my new house. Been a long time member and finally can build at the new spot. I am not going crazy. Will be a 4x8 ft 2-3 ft deep formal pond right off of my deck. I am planning to use a bog to filter it. What are some design must haves for a bog? I have worked the last 7 years on my landscaping and now i want my pond back. Will have plants and probably a few fancy tails in it.