old lighting, new 40Breeder. Will this work? - The Planted Tank Forum
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post #1 of 4 (permalink) Old 06-04-2010, 07:21 PM Thread Starter
Join Date: Jun 2010
Location: Austin, TX
Posts: 2
old lighting, new 40Breeder. Will this work?

Hi all.

I recently upgraded to a 16" high 40 breeder for my two goldfish, from a 28 gallon 18" high. On the old tank I had an AH supply 55W 24" fixture. I've never dosed CO2, but I run a planted refugium on reverse cycle and I've always thought that maybe the two tanks dose eachother with CO2 alternately (though I've never been able to really verify that). Sometimes I add florinaxis but I forget a lot. I could also add excel, but I haven't recently because it seems to make my vals short and stocky rather than long and graceful.

Now that I've upgraded I have a bunch of lights sitting around. I have 2 18W craptastic "kit" fixtures, and then I have the good AH supply setup.

I know with standard wpg estimates I'd need like 80W for comparable light to what I had before, but I'm wondering if I really need that much since the bulb is lowered by 2". I plan to mostly plant under the 24" of fixture, leaving some shadowy edges for anubias and other lower light plants. Is this 55W going to be enough? If not, would adding one of the 18W'ers help, or not really?

italian vals
java moss
crinum calimastratum
argentine sword,
pygmy chain sword
giant hair grass

I'd like to do some carpeting plants like HC, micro sword, or dwarf hairgrass, but the goldfish are more of a problem than the tank conditions for that. Still I'd like to not have the light be the limiting factor.

Thanks for your help!
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post #2 of 4 (permalink) Old 06-04-2010, 09:11 PM
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Join Date: Sep 2009
Location: Seattle, Washington
Posts: 636
I can't really help you with the lights, but I can tell you that in my experience goldfish are too dang curious to let a carpet plant get established. Unless you plant dwarf hairgrass in pretty large plugs, the goldfish are going to be constantly pulling them up as they scavenge around the tank.

At least, that's what my comet did to my would-be hairgrass carpet. It did alright when I just planted the whole plug I got from the store, but once I took it apart to encourage growth, practically every time I looked at the tank he had pulled one or two up.
You could try using 1/2-inch sized ones and see if they work better, but they take longer to fill in that way.

Although maybe your goldfish aren't as curious as mine; obviously it's ultimately your call based on what you know about your fish, but I would advise that if you try it, keep in mind it just might not work.

Joy to the fishes!

Last edited by Jadelin; 06-04-2010 at 09:13 PM. Reason: Clarity
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post #3 of 4 (permalink) Old 06-05-2010, 01:04 AM Thread Starter
Join Date: Jun 2010
Location: Austin, TX
Posts: 2
Yeah, I know carpet plants are kind of a pipe dream with goldfish (even my fancies). Mostly I want the other plants that are currently in there to not start suffering because I don't have enough light.
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post #4 of 4 (permalink) Old 06-05-2010, 01:13 AM
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Location: Sacramento, CA
Posts: 21,015
An AH Supply light gives medium light at 16 inches from the bulb. Unless you want to get really rapid growth, that's plenty for almost all plants, assuming good CO2. But, a 40 breeder tank is 18 inches from front to back, so a single light doesn't give very uniform lighting. Adding your other lights, separated a ways from the AH Supply light might give you adequate uniformity of lighting.

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40 breeder, watts

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