I currently have a 200 gallon with a fluval 405,under gravel filter with 2 powers head 120gph. I was thinking to upgrading to a fx5 is the cost worth it.
I Personally would dump the Undergravel. But that's just me. I haven't heard stories of them being good. An FX5 would serve you well in a 200G But what are you keeping?
I don't have a FX5 but I can assure you the cost is definitely worth it. Around $200 for one on amazon.
I would also get rid of your under gravel filter(s)...they don't work for sh@# and trap all the fishes waste and food underneath. Once you lift up the undergravel filter(s) to remove them, you'll see what I mean. An enormous cloud of detritus will arise
I would keep the fluval 405 and add a sump if you need more filtration.
What is the weakness in your present configuration? Do you have high Ammonia or Nitrite levels?
My 110g came with a under gravel filter. I do not use it. The previous owner said he liked having it as padding to keep big rocks off of the bottom glass. I doubt your UG is hurting anything.
I have a VATF and a RT Payara. I feed them shrimp and smelt they are about 6 inches I just dont want the nitrates to rise. My nitrates 0,nitrites 0, ph 7.6 temp 81 degrees. These are my first predator fish. I have owned every cichlid in the planet just wanted to change. Just sold my 16 inch dovii. You are right the ug is a pain to keep clean underneath but I have always owned them with no water problems.
Bio filters convert ammonia and nitrites to Nitrates. A FX5 will also process the waste into nitrates and provide some mechanical filtration. An FX5 has no ability to remove nitrates.
The ways to reduce nitrates:
1) Water Changes!!!!
2) Plants (aquas or terrestrial)
3) Algae filter
4) Nitrate filter
For super clear water I really like DE filters... but most on here seem to think they are too much hassle.
I would get an Eheim 2262 before buying an FX5 if money is not an issue. The difference between the two is night and day. The Eheim is far more superior. I have both.
I am pretty notorious for adding filters with no reason. I found an XP3 that I had no need for for $25. I ran it for 6 months and now it sits in my garage. If you just want to add a filter I am certainly not one to tell you not to. But it sounds like you are adding a filter when there is no need for one.
If you have a particular problem or something you want to accomplish then recommending a filter would be easy. If your primary worry is Nitrates go to Home depot and pick up a Pothos plant for $5 and hang clippings from it over the side of your tank. This will do a lot more for the health of your tank than a $200+ FX5.
Thanks guys really appreciate the input. I think I am going to get plants first and the pothos. The guy at my lfs swears by them for removing nitrates. I am just trying to be proactive before I lose some expensive fish.