Will the 306 be too big for the 40gal cichlid tank? If it is should I go with the 206?
1239729
I use a Fluval 305 on a 4 gallon nano tank (I had it left over from another tank). I have the flow rate turned down and it works perfectly. You can turn this thing down to a trickle. Unless you're trying to use it on a fish bowl (which physically wouldn't work anyway), there really is no tank too small.
1239730
Bigger filter equals bigger bio filtration so you can increase your bio load. [ more fish ]
1239731
I think the 306 would be perfect for a 40 gal tank. It has adjustable flow via a valve at the connections. I have a 206 on my 29 gal running full flow with community fish. Not excessive current. The flow rate is higher on the 306 by about 50%, but your tank is roughly 40% larger than mine. Plus it has more media capacity to increase filtration for those dirty cichlids.
1239732
I had a 306 on my 40 gallon breeder and it completely cleared up the sand and dirt that would go everywhere when u messed with the tank. There is an adjustable control if you want less watee flow. But I just got a 90 gallon and I have to get a g6. The price of the g6 is not pleasing lol.
1239733
The more filtration the better, plus you can adjust the flow rate on the unit. I have the 406 in my 55g and it keeps the water crystal clear...and I mean CRYSTAL clear!!!! You should be fine. This is my first canister filter and I love it. I have to check behind the tank sometimes to make sure its running it that quiet.
1239734
I use the 406 on my 40 gallon planted Discus tank and it works great! So I might suggest you go up to the 406.
1780790
For tall tanks like yours, I would take the tube down to within three or four inches of the bottom if you can. This will give a better top to bottom turn over of the water. I agree that going to the bigger filter (#60) would be a good idea. It's hard to over filter a tank. If this will be the only system working, I would go to the #60 filter. If you are running an under gravel filter also, then the #40 will be fine.
1890251
I am using the 406 on my 60 gallon tank. Prior to that I had a 55 gallon that I was using the 406 on. I like it better than the 306. Some may say is a little overkill but that's how I like it.
875602
I have a 10 gallon and this one is way big for me. Should work on a 40 gallon without an issue
585551
Honestly I'm impressed with my 306 I have a red ear slider turtle with tons of fish my 30 gal tank has been clean for months I just replace the sponges every now and then
1014029
The 206 would be much too powerful for a 5 gallon tank, even at the minimum flow rate. I've got my 29 gallon at the minimum flow rate and it still creates a fairly strong current across the back of the tank.
475038
The 750 is a good size for your tank. I have the 1150 for a 75. The key is the position. Experiment with a few to see what your fish like.
1134495
Yes, it should be just about perfect. I had the 306 on a 40 gallon you can control the speed and decrease the water flow or go monsoon style and clear up cloudy water quickly. You still should get a regular top side filter. Check out the fluval aquaclears :) I had the aquaclear 100 up to 90 gallons, but flow can also be decreased. It's worth the price difference
1579155
Just get one and try it out. I believe the tank will be more than good enough for your tank.
449198
A 200 should do fine for a 50 gallon. I run a 150 in my 30 and it has no problems maintaining the temp at all.
1073406
i think 2 of hydor koralia 1500 is too much on the 55 gallon tank. i have a smallest one(550-600gph) on my 35 tank(fresh water), and the size(not power level) a kind of big on the tank, it will bother your view for the tank. i feeling too much stuff on my simple iwagumi tank.other thing is 2 of 1500 maybe too strong to running the water to messed up your plant or decorations. if you want to get 2 of those on it , small one is good enough .
1828965
They only recommend the 3152 for tanks up to 50 gals. so the 3155 might be a better option for you.
1271893
It should work ok for a 30G tank. I have it on a 27G tank. It's rather weak even with almost no media in the treys. If you have saltwater tank with corals that need some current, this is too week. I know it's rated for much larger tank, but it's grossly overrated. I just got this too:( I'm really regretting it. It's unfortunate, but a powerhead will be needed for me:(Just to be clear, even if you have a fresh water tank, you liken't can't get enough flow to filter the whole tank with this power. Go up a model or 2 and get more power. Other than the lack of power, I do like this unit. I just wish that they have marketed it with the right GPH, and that I have purchased a more powerful one. It should work ok for a 30G tank. I have it on a 27G tank. It's rather weak even with almost no media in the treys. If you have saltwater tank with corals that need some current, this is too week. I know it's rated for much larger tank, but it's grossly overrated. I just got this too:( I'm really regretting it. It's unfortunate, but a powerhead will be needed for me:(Just to be clear, even if you have a fresh water tank, you liken't can't get enough flow to filter the whole tank with this power. Go up a model or 2 and get more power. Other than the lack of power, I... » Read More It should work ok for a 30G tank. I have it on a 27G tank. It's rather weak even with almost no media in the treys. If you have saltwater tank with corals that need some current, this is too week. I know it's rated for much larger tank, but it's grossly overrated. I just got this too:( I'm really regretting it. It's unfortunate, but a powerhead will be needed for me:(Just to be clear, even if you have a fresh water tank, you liken't can't get enough flow to filter the whole tank with this power. Go up a model or 2 and get more power. Other than the lack of power, I do like this unit. I just wish that they have marketed it with the right GPH, and that I have purchased a more powerful one. « Show Less
1099567
It is large enough I have mine on 50 gallon tank but the impeller on the skimmer broke after about 1 month , but Instant Ocean Replaced it immediatley after calling customer service
215086
I have 2 Mediums on a 100gal freshwater and they are the best filters ever. Been running strong for 8 years. That being said, get the large.
1120800
Honestly I have a 50 gallon with the 306 on it and I'm not very happy. I'm trying different things so I can't condemn the 306 just yet. What I can tell you is a have a 75 gallon for 2 pretty much full size Red Eared Sliders with a condo so the tank is full and I have about 20 Goldfish with the Fluval FX6 and the water is crystal clear! Have it on for almost 2 months and haven't even need to do a water change yet. So worth the money. And if at this point I wish I would have gotten the FX6 for my 50. My advise go with the FX6 --so worth the extra money!
1780788
I have been using theses filters for ever, I would suggest moving up to one size bigger, the larger has an extension tube that comes with it, this one only goes about 6" into the water. When it comes to filtration, bigger is better if you have room, the larger has 2 chambers/holds 2 media inserts, you will be much happier and the tank will be much cleaner, and there isn't a lot of difference in the cost.