Determining lighting duration. - Tropical Fish Keeping - Aquarium fish care and resources
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post #1 of 2 Old 12-31-2012, 04:57 PM Thread Starter
Stoke88's Avatar
Determining lighting duration.

I'm starting to get small spots of algae on the glass in my 75g tank. I started out with 12hrs of light a day and have lowered it to 11hrs as of now. I use Flourish Comp as directed on the back twice weekly. Is the 11hrs still to much light daily?

10g - Red Cherry Shirmp
20g long - SE Asia "Biotope"
30g - Jasper's (GF) Tank
75g - South American "Biotope"
Plenty of empties...
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post #2 of 2 Old 12-31-2012, 05:59 PM
Byron's Avatar
I would judge the light duration by more than just spot algae. The overall response of the plants, and any increase in algae such as brush algae. The light has to be balanced by available nutrients, and if it is, the plants will use both and algae won't have much chance. The more plants and the more faster-growing plants, the more nutrients are needed and the longer the light duration can be if nutrients are available.

As for green dot algae--the type that appears as pinhead sized dots and takes some serious scraping to remove--this is best handled by cleaning the inside of the glass at every water change even if you don't see any algae. I have ever only seen this algae in my 115g tank, for whatever reason, but I never see it when I run a sponge scraper over the inside of the front glass (and usually the sides too) at the weekly water change.


Byron Hosking, BMus, MA
Vancouver, BC, Canada

The aquarist is one who must learn the ways of the biologist, the chemist, and the veterinarian. [unknown source]

Something we all need to remember: The fish you've acquired was quite happy not being owned by you, minding its own business. If you’re going to take it under your wing then you’re responsible for it. Every aspect of its life is under your control, from water quality and temperature to swimming space. [Nathan Hill in PFK]
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