Under gravel cleaners

[Cowboy]

Originally Posted by 0sprey

For a fish-only system, UGFs work just fine. But if you want corals or other inverts, cross them off the list. They become solid nitrate factories in a fairly short timespan.
Robert Fenner's Conscientious Marine Aquarist has an excellent overview of the different types of systems, and notes in detail the benefits and disadvantages of undergravel filters. Order it in from your local library and read it. Well worth your time.

this is in an fresh water tank but i do have plants that i am trying to grow