I have a 90 gal FW planted tank. Compared to my 125 gal reef, it's a bit smaller, but the equipment can be almost as expensive as a reef. In a planted tank, once you get into specialized substrata, CO2 injection, and good driftwood. you can spend a lot of money fast. The up side is that it's less expensive to run because you don't need the extreme lighting or flow like you see in a reef.
A planted tank works a lot differently from a reef. In a reef systems, you want nitrates and phosphates as low as possible to keep algae down, and canister filters are considered undesirable. In planted tank systems, you add nitrates and phosphates to maintain the fertilization needed for the plants. Canister filters are highly desirable in a planted tank, because any nitrates produced are consumed by the plants. It's amazing how much nitrate and phosphate a heavily planted tank can consume.
I have my reef and planted tank side by side, and it's quite a contrast.
A planted tank works a lot differently from a reef. In a reef systems, you want nitrates and phosphates as low as possible to keep algae down, and canister filters are considered undesirable. In planted tank systems, you add nitrates and phosphates to maintain the fertilization needed for the plants. Canister filters are highly desirable in a planted tank, because any nitrates produced are consumed by the plants. It's amazing how much nitrate and phosphate a heavily planted tank can consume.
I have my reef and planted tank side by side, and it's quite a contrast.