09-23-2009, 06:51 PM
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Originally Posted by JohnnyD44
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
nitrate - 40....maybe 50ppm
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.