10-27-2006, 11:57 PM
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I'm going to ask you to check phosphate levels, I want to make sure that's not the cause of the brown algae problem before we go any further.
I'm also wondering how soon before you intend to upgrade the size of this tank? With the population you have listed, that tank is quite crowded with fish. Angelfish shouldn't be put into a 10 gallon tank. Angelfish average 8 inches in diameter when full grown, and grow quickly. The other thing about angelfish is that they are territorial and get more aggressive as they mature. I would expect to see conflict between the fish sometime in the next few months for that reason alone.
As for the lighting change, what might have been meant was a different type of bulb, not a higher watt bulb of the same type. The spectrum of light being put out by your bulb will have a huge effect on what happens to algae growth. Brown algae thrives on the red/orange spectrum... if you change the bulb to something without such red/orange intensity to it, this may indeed help.
I read through your tank stats, and for starters, the fish were added quite soon after starting the tank, which may have caused some problems with acheiving your balance properly with cycling. The .5 nitrite you are now showing could be due to cleaning everything in the tank. If you depleted any of the bacteria culture, especially that soon after cycling, you may have caused a mini cycle, which is what it appears to be to me.
One thing to remember, when cleaning, don't clean the filter/media at the same time you clean gravel and other decorations in the tank. These are the 2 places your bacteria culture will thrive, and if both are cleaned at the same time, the tank will go through a "mini cycle" until the bacteria level catches up to the waste level.
I guess at this point all I can do is wait on results for phosphates and heavily suggest moving the angelfish out to a minimum of 55 - 75 gallons, and possibly upgrading to a larger tank for the remaining fish. I wouldn't work with anything less than 25 - 30 gallons for what you have now, minus the angelfish.