for a 20 gallon saltwater tank should i have 1 or 2 of these?
1579637
I would think one should give you a good current. Remember your filtration system is also creating current. In my 10 gallon reef, I have this and a HOB for a 30 gallon but I was aiming for a higher current flow for my corals like the Xenia. With this powerhead, I can see an extremely slow movement of my sand. I must say extremely slow because I only can see it if I look at my sand at close up. Nothing that would create a sand shift though. Hope this helps.
1579638
One will be plenty. I only have one in my 36 gallon and it moves more then enough water.
1579639
Once if these should certainly be enough in most applications. It would depend on your tank set up and what your desired flow setup is, but it should be enough for most uses.
1579640
1 would be good, but it depends on what you plan on having in it. If sps than 2 with controller would be better. Softies, zoas, mushrooms, etc... 1 would be fine
1579641
I wouldn't put sps corals in a 20 gal anyway, too expensive, and too much risk
1162554
I have a 20 gallon, and a 30 gallon, and the gravel is about 2 1/2 inches deep. I would say two bags should do.
1216380
You'll need one more if you have live plants. If heavily planted, I suggest to fill all three slots, one red and two white strips or red, blue and white. If it's a fish only tank, just the single strip that comes with the package should be enough.
1950470
Either one will work but for a 29 gallon tank I think the small one would be ok.
1563143
Gary, My 32 gallon tank came with one. It was listed at the bottom of the Product Details. That being said, I didn't notice it in the description and ended up with 2. I figured "What the heck", and kept it as a spare.
1837209
I use these for my breeder tanks 20 gal. it just provides enough beneficial bactiria for two 6 inch fish for couple of day as they require frequent water changes so i think (NO)
519516
You should put one on if the tank is unheated. You WILL need one if you heat your tank tank to cut back on water loss from evaporation as well as heat loss.
1917124
One is not enough for that tank. Buy two and dim them if there is too much light. These are nice lights and are a great value.
312030
A single 150 would work. These never get very hot but just put it where your have the highest circulation. I have mine next to a U4 submersible filter in my 50 gallon tank. Quite frankly, I keep my place warm/cool all the time, 68-80, so mine probably does not come on a lot anyway. If you have African Cichlids that would be different but I just have SAE, Platys, Japanese trapdoors, etc. which like it in the mid 70's anyway.
1463628
I don't think you want to use 2 pumps at the same time. use one or the other but not both. a sand filter is a better filter in my opinion but the salt water system is much easier to maintain. you might try and return the saltwater pump for one that has a sand filter.
1434744
It's best to figure on one fish per gallon. More can survive but keeping the tank clean is more work.
768680
I have one for my 20 gallon regular tank with three small turtles. I would recommend it for a heavily stocked 20 gallon.
1972004
Sure, but you'll be operating it at capacity and that might lower the life expectancy of the heater. I used two to reduce the load on just one big one and if one does go out, the other can carry the load until I get a new one. My tank is a marine tank, it might not be as big a deal for fresh water. Hope that helped.
2204794
6 months usage for a 20 gallon tank. depending on how heavily stocked and if it is a marine tank or a freshwater tank.
1751045
Not a lot if you ask me. It's worth it if you do. If I were you I would do 3. Or one double bio wheel along with one of these. That's what I use on my 30 gallon salt tank. You actually should consider using 2 double bio wheels. That way you'll have 4 outlets instead of 2. Just my opinion. More filtration is better than not enough. I would use some polishing pads in all of em if I were you. They help keep the water clear as a whistle. Hope this helped.
1096813
If you are doing a reef tank, I would go with 2 units, if its just saltwater fish with artificial plants and stuff, you could probably get away with 1 unit. I am looking to maybe upgrade to something like that, I have looked at a 47 Gallon bowfront, and would add another unit, and maybe play around with lowering the light level, or cutting back the white LED levels some. Under full blue LED's only, everything in my tank takes on completely different colors, and glows a bright blue, pretty cool at night sometimes.
557767
I was told you need at least 55 gallons for saltwater aquarium. This one is 6 or 12 gallons.