which one would go better the 18 to 24 or 24 to 36 on a 20 high tank length is a rough 24
1614904
You want full coverage of your tank. The minimum sizes of the fixtures are the actual length of the light bar, and then there are legs that pull out to extend to fit onto larger tanks. If you tank is 24" wide, you definitely want the 24" fixture, else you'll have a light that only lights up the middle, with 3" of unlit area to each side.
1614905
You would want the 24"-36"for maximum light coverage of the entire length of the tank.
1614906
24-36" because you want the LEDs to span the length of the tank. You'll have darker spots on the end with the 18-24" light.
1518136
I would go with 24 and then cut it down. Also, get the pool cove pieces. They are great. For my 21', I got the 19 pack.. I can't remember if I had any extra
191838
Gallons per day as others have stated but they both fit in the chamber so either will actually work. The 18 is much slimmer so even if you don't need 18 gallons per day the 24 is likely to last quie a bit longer and therefore justify the extra cost. Again, they will both fit if you have chosen the actual model number for your unit. Hope that helps?!
430941
The 12" should fit. For example, my tank is 30" and the 30" light fits perfectly. But, if your tank is deeper then about 24" I would say you would need a more powerful light.
643908
My canvas was the typical 18. A 20 will just give you a seat that is less taut
1503370
have both,the 36 stays in the truck, because of bigger overall size. the 25 goes with me, lighter and takes less room in my gear.
1567233
The 24 x 12 will fit a regular 20 gallon tank. If you have the 20 gallon long tank you will need the 30x 12. Just take a quick measurement across the top of your tank.
1998644
You don't want the 20, I have a 20 inch tank and the 20 inch light fits exactly edge to edge.
1917820
If you have an all glass top you could get a 24, though it wouldn't be stable sitting there. Assuming you have an open tank, you can either get a 30, or 2 12" lights. The 2 12s would certainly be more costly, but might give you more control over the light output.
912799
Sorry not at um I think the 24 is a little small not as big as pict. Go for the 48 .I have one of each
120037
My tank is 30 and this one works perfect since its right in the middle of the ranges. If u have a 20 I'd go with the smaller one.
773008
Aloha Mike I got the 24" one. i like it better because it wraps more and gives me personally better support. Hope this helps. God bless and have a God day!Kani'ala
2205363
I would go with the 23 watt for a 55. The 9 watt takes about a week to clear my 27 gal. great product
1967472
M8 equivalent is 5/18 with 18 threads per inch, 24 mm is a hair less than one inch and is the diameter of the pad, and the 1.25 is the length of the threaded rod in inches. If the length was given as 30mm it would have been a little more consistent.
2161474
If I rememer correctly the 24" will work but it won't go across the entire tank so you will have some part either not lit or dinner than the rest. I would suggest going bigger especially if you are going to have live plants.
272182
For a 25,000 gallon pool, I recommend the FNS plus 60.... The 48 would work, why stretch a smaller filter.
2026252
Personally I would go with the 20 gallon pump, if the air is too much you can turn it down if you have the air valves installed.