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What lighting changes will have a positive impact on the reduction of algae?

  • Reduce lighting period

    Votes: 119 32.1%
  • Reduce lighting intensity

    Votes: 45 12.1%
  • Reduce lighting period and intensity

    Votes: 83 22.4%
  • Program a "noon" burst of light (ie 3hrs 1.5wpg, 4hrs 3wpg, 3hrs 1.5wpg)

    Votes: 36 9.7%
  • Program a lights off "siesta" (ie lights on 5hrs, off for 5hrs, on for 5hrs)

    Votes: 33 8.9%
  • Change the spectrum/color temperature of lights

    Votes: 24 6.5%
  • I don't know: I never have algae! ;-)

    Votes: 31 8.4%
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299 Posts
I've said this before, but I grew some of my nicest Rotala macrandra and Pogostemon stellatus with 136 of T-8 (96w, 9325K) and T-12 (40w, 5500K? Nutrigrow) lighting. I did have pressurized CO2 which was a big help. Algae was practically non existent and P. stellatus rarely if ever stunted. The plants grew much slower with that amount of light, but so did the algae.

Why is it that such high light levels are recommended and do we really need it for most plants?
watts per gallon isnt a truly accurate way to mearusre lighting at all. 110 watts with a good reflector or separate relfectors for hte bulbs is a whole different animal then 110 watts with a poor relflector. I think this is where people are giving advice without know what the deal is. And pressurized co2 makes a world of difference. moderate lighting with press co2 will grow almost anything, just more slowly. However high lighting plus excel or diy co2 will almost always cause algae disaster or take up all your time mixing yeast bottles. 2 watts per gallon of pc light with AH supply lighting + press co2 will def grow almost anything and fairly well.

299 Posts
I am relatively a very new member but have been visiting this site very often. My aquarium has all the algae you can think of and also all other which you cant think of. I wonder how come my aquarium can home so many kinds of algae.
The water parameter seems fine to me. ph 6.7, GH 3deg, NO3 10 mg/l, NO2 negligible and water temp of 26-27 deg celcius.
The tank is approx 95 gallons and i am using two MH 150 watts each switched on for 5 hrs and there after two 18 watts osram fluora. for next 6 hours. I am using pressuried co2. The plants are growing very well but even better the far i have noticed black beard algae, green spot algae, dust algae, thread algae. theres another algae some what blk brown in colour and appears as small algae balls stuck to my gravel.
before i bought these MH i did my required reiki and came across with MH with ceremic techology and found their spectrum good enough for consideration. the spectrum were peaking in red and blue, 4200 k, 14000 lumens and cri of 95.
I am following estimative index for fertilisation which involves khpo4,kno3 and microsol-b.
Any one who can render some advise.

Tarun Jawa
Id be willing to bet that your co2 is too low. bump it up and get a drop checker. 2nd, with all that light your probably bottoming out your co2, stop using test kits and start dosing EI. 3rd, your tank should be heavily planted with all that light, at least until you get your algae in check. If you havent already get a bunch of cheap fast growers to get your tank under control. You should be dosing a pretty high amount of N and P with MH light and Press Co2.
1 - 2 of 2 Posts
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