Help with Brown Algae...... - Page 2 - Tropical Fish Keeping - Aquarium fish care and resources
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post #11 of 29 Old 09-23-2009, 05:51 PM
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Originally Posted by JohnnyD44 View Post
I have two 24" lights.....the wattage on them are 20W each (so 40 total?) ....it seems weird, but I didn't have the problem with the algae till my wife and I started not using the ceiling lights and using two small end table lamps instead (save electricity and they look nicer, lol)...could that have anything to do with it? my lights are on from about 4pm to 10pm....6 hours....is that not enough light?

Rocks: I've decided that the rocks have not contributed to the algae growth, but i do know now that they are going to increase the hardness of my water (ph has remained unchanged).....that is a health hazzard to my fish correct? I hate to, but I think tonighit when I do my pwc, I'm going to take them out.....thoughts on hardness hurting my fish????

water parameters before pwc tonight:
ammonia - 0
nitrite - 0
ph 7.4-7.6
nitrate - 40....maybe 50ppm

Johnny
There's really no evidence that the rocks are raising the hardness; while it is possible, I would suspect that if they were the pH would rise also, even if slightly, but you say it has not. Whenever I have used dolomite to raise the hardness, the pH also rises correspondingly. Of course, it is possible that your water has a sufficient carbonate hardness to act as a pH buffer. Any idea what the dGH and dKH of your tap water is?

Something else jumps out at me, your nitrates are high at 40-50ppm. While it is true that most fish can tolerate this, some cannot. And the recommendations I have seen here and elsewhere are aiming at keeping them below 20ppm. Partial water changes are the only way to do this (in a non-planted tank). And weekly pwc of 40-50% should do so. If this isn't, then I would look for the reason. Possibilities are overfeeding, too many fish for the biological balance, decaying animal/plant material. These are the usual causes.

One last comment on the light: 40 watts on a 55g for only six hours a day is very low light, and probably contributing to the brown algae. Plus the high nitrates. The rocks may have nothing to do with the algae.

Byron.

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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post #12 of 29 Old 09-23-2009, 06:07 PM Thread Starter
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Thanks alot guys!!!!

My nitrates has only started rise when the brown algae started to appear.....they usually are in check around 15-20ppm.....I do a 30% pwc every sunday afternoon....they usually are fine.....

So the rocks might be able to stay, huh?? thats good news I guess......

If the lights are contributing to the brown algae and high nitrates....should I buy higher watt bulbs or leave the lights on longer? or both?

thanks for helping me figure this one everyone....I'm glad all my fish are healthy looking and eating great...they thank you as well...
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post #13 of 29 Old 09-23-2009, 06:13 PM
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I'm not trying to jump into your thread and steal it to answer my problems, but rather add to the conversation to see if we can get better answers on what actually triggers the diatoms.

On the two tanks i have had problems with, one of them has 1.5 watts per gallon, and the other is .75 watts per gallon. Maybe the .75 is on the low side, I'm not sure. But i would think 1.5 watts per gallon would be more than enough, would it not? And i run them for a solid 8 hours per day.
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post #14 of 29 Old 09-23-2009, 06:43 PM
my 5 gallon has 4 watts per gallon... and it has brown diatoms. Does light spectrum matter?
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post #15 of 29 Old 09-23-2009, 08:07 PM Thread Starter
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thats what I"m starting to gather Sin....hopefully someone will chime in again about lights and wattage
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post #16 of 29 Old 09-23-2009, 11:22 PM
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Yes it dos matter I have 4 watts gallon. And i leave my lights on for 12 hrs aday. never have any problems with that but when i ran it with 2 watts i had the bloom. Also if your filter media isnt changed reguarly then you would also get the brown diatom.
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post #17 of 29 Old 09-23-2009, 11:25 PM
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Johnny the rocks can stay i wouldnt take them out. rais you wattage and leave them on longer
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post #18 of 29 Old 09-24-2009, 07:15 AM Thread Starter
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so at 4 watts per gallon, I need 210 watts for my 55G tank? thats seems like overkill?
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post #19 of 29 Old 09-24-2009, 10:53 AM
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Originally Posted by JohnnyD44 View Post
so at 4 watts per gallon, I need 210 watts for my 55G tank? thats seems like overkill?
I cannot recommend this. In a planted tank I would go with 1-2 watts per gallon full spectrum max. This tank has no plants, so while you have diatoms now you will have green algae with light at a level of 4 watts per gallon, particularly with the high nitrate. Algae are plants, they need light and nutrients; when they become a problem it is because the light and nutrients are high, and the algae makes use of it.

Leaving the present lights on for a longer period seems more practical. And reducing the nutrients (nitrates are a key to this). Johnny, you mentioned the diatoms appeared with the nitrate rise--the two are clearly connected, although the latter probably caused the former, not the reverse.

Byron.

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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post #20 of 29 Old 09-24-2009, 11:08 AM
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Nt enough light can cause diatoms to grow. I agree with increasing your light and it should go away.


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