aquarium.guideFish pages, lists, fit marks and tools use the tank you pick here.
Plan everything for this tank →17 lights, drawn at their published size on your tank and checked against the maker’s rating.
17 models
Fit marked for 20 gallon long (example)
Lights · Planted LED
Spans a 30¼ in long tank
Consider: The 24–34 inch span tells you it fits your tank, not whether it lights your plants well. Compare published PAR at your water depth before choosing it for demanding plants.
Lights · Clip-on planted LED
Rated for a 20 gal tank
Consider: No built-in timer is listed. Plan how you will switch it on and off; use depth-specific light data before choosing it for demanding plants.
Lights · Planted LED
Spans a 30¼ in long tank
Consider: Operation depends on the app. Check phone compatibility before purchase, then measure the tank span against its 23–35 inch mounting range.
Lights · Planted LED
Spans a 30¼ in long tank
Consider: Plug it in, set the clock and it runs the day on its own: full-spectrum light from 6:30 am to 6:30 pm, then blue until 11:30 pm. For less than full brightness use the DIY mode, since the standard mode goes back to 100% each day.
Lights · Planted LED
Spans 15–24 in; this tank is 30¼ in long
Consider: App control is part of the setup. Check that your phone supports the Fluval app, then measure the tank span against the 15–24 inch mounting range.
Lights · Planted LED
Spans 24 in; this tank is 30¼ in long
Consider: No depth-specific PAR table is published. For demanding plants or a deep tank, compare a fixture with published measurements at the relevant depth.
Lights · Planted LED
Spans 36 in; this tank is 30¼ in long
Consider: No depth-specific PAR table is published. For demanding plants or a deep tank, compare a fixture with published measurements at the relevant depth.
Lights · Planted LED
Spans 15–24 in; this tank is 30¼ in long
Consider: Operation depends on the app. Check phone compatibility before purchase, then measure the tank span against its 15–24 inch mounting range.
Lights · Planted LED
Spans 12–18 in; this tank is 30¼ in long
Consider: Plug it in, set the clock and it runs the day on its own: full-spectrum light from 6:30 am to 6:30 pm, then blue until 11:30 pm. For less than full brightness use the DIY mode, since the standard mode goes back to 100% each day.
Lights · Planted LED
Spans 18–24 in; this tank is 30¼ in long
Consider: Plug it in, set the clock and it runs the day on its own: full-spectrum light from 6:30 am to 6:30 pm, then blue until 11:30 pm. For less than full brightness use the DIY mode, since the standard mode goes back to 100% each day.
Lights · Planted LED
Spans 24–30 in; this tank is 30¼ in long
Consider: Plug it in, set the clock and it runs the day on its own: full-spectrum light from 6:30 am to 6:30 pm, then blue until 11:30 pm. For less than full brightness use the DIY mode, since the standard mode goes back to 100% each day.
Lights · Planted LED
Spans 36–42 in; this tank is 30¼ in long
Consider: Plug it in, set the clock and it runs the day on its own: full-spectrum light from 6:30 am to 6:30 pm, then blue until 11:30 pm. For less than full brightness use the DIY mode, since the standard mode goes back to 100% each day.
Lights · Planted LED
Spans 48–55 in; this tank is 30¼ in long
Consider: Plug it in, set the clock and it runs the day on its own: full-spectrum light from 6:30 am to 6:30 pm, then blue until 11:30 pm. For less than full brightness use the DIY mode, since the standard mode goes back to 100% each day.
Lights · Planted LED
Spans 36–46 in; this tank is 30¼ in long
Consider: App control is part of the setup. Check that your phone supports the Fluval app, then measure the tank span against the 36–46 inch mounting range.
Lights · Planted LED
Spans 48–60 in; this tank is 30¼ in long
Consider: App control is part of the setup. Check that your phone supports the Fluval app, then measure the tank span against the 48–60 inch mounting range.
Lights · Planted LED
Spans 35–49 in; this tank is 30¼ in long
Consider: Operation depends on the app. Check phone compatibility before purchase, then measure the tank span against its 35–49 inch mounting range.
Lights · Planted LED
Spans 46.25–61 in; this tank is 30¼ in long
Consider: Operation depends on the app. Check phone compatibility before purchase, then measure the tank span against its 46¼–61 inch mounting range.
Clear the search or choose another tank size. The size filter only shows filters and heaters that their maker rates for that size.
The size filter and the fit marks use each maker’s tank-size rating for filters and heaters and the fixture span for lights. Drawings use the makers’ published sizes; positions are approximate. Where a maker doesn’t publish a rating, we don’t guess one; each model page says what is missing.
Match the mounting span and lid openings first. For plants, compare published output at the relevant depth when it is available; watts and fixture length alone cannot tell you how much light reaches the substrate.