Crazy algae problem! (please help ASAP)

cgcaver

AC Members
Jan 2, 2005
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I have a planted 55g with 2wpg on the plants and a AC500 doing the dirty work. I have an 5" oscar, 5" pleco, 7" ropefish. I leave the lights on for 8-10 hours a day. I do a weekly water 75%-80% water change, and at that time change the floss, and rinse the sponge/biomax. I have Flourish root-tabs in the sand for my plants, and when I do a weekly water change, I usually treat the water with a little Fe, K, Flourish, and Flourish Excel. My current water parems are:

7.6 PH
0 NH4
0 NO2
20ppm NO3
1.5ppm PO4

This is about 6 days past my last water change (which i planned on doing tomorrow).


So, here's my problem: a mere 2-3 days after I do my water change, my water begins to get pretty cloudy. Its mostly a whitish color if I look at it hard enough, then a day or two later it turns into more of a greenish color if I had to describe it. Towards the 4-5 day after the water change, I start to notice some green splotches on my glass. My pleco does a VERY good job of eating algae usually, so it doesn't ever get really really bad.

Now, here's my question. What the heck kinda algae is this? Why can't I ever get the "good" kinda like beard/carpet algae LOL. I have nice drift wood and porous statues in my water, why cant THEY ever get some good algae growth :p ?!?! Before you jump down my throat about the high bio-load, let me say this. My plants have always done a very good job of keeping my nitrates and phosphates down. I used to check my water religiously, and this problem really only started about a month ago. I know my nitrates and phosphates are a lil on the higher side, but is that REALLY whats causing these non-stop blooms?! Also, I've heard that adding some aquarium salt can help stop blooms... true? I dont wanna hurt my fish or plants :\ Also, I was wondering if dosing something more would help? But then I was afraid I was dosing too much stuff... I was wondering if potassium was my limiting nutrient on my plants, and if I added more of it, they may be able to "choke" the algae outta the water...?

Can you guys please help? I'll be glad to provide any other info needed. Im so sick of only getting to enjoy clear water for 1-2 days max after a water change. My tank looks like poop!
 
what kind of plants do you have? how many? and how are they doing? reason I ask is that usually if your plants are thriving then algae isnt. So it may be something youre missing with fertilizer. Also flourish excel is something you should be adding daily...have you measured your KH? This will give us an idea on your CO2 levels but chances are they are not high enough. Your nitrates are on the high side and its probobly because your plants are missing something that is enabling them to suck them up.

In regards to your cloudy water after water changes. You said that you are doing a 75-80% water change and cleaning your filter at the same time? This seems like overkill and youre probobly sending your tank into a mini cycle. Just do a 50% water change and dont change all your filter media all at once. And when your rinse your filter media...make sure you rinse it with the water from the tank..not tap water.
 
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yeh... my plants have seen better days. I dont have a KH test, but i'll start adding the excel daily for carbon. Would you recommend that over more potassium?
 
cgcaver said:
yeh... my plants have seen better days. I dont have a KH test, but i'll start adding the excel daily for carbon. Would you recommend that over more potassium?

Not OVER more Potassium...but in addition to it. Iron and Potassium like 2 or 3 times a week.....and the excel daily. Make sure you dont add anything with Phosphates in it. If they are already high that will just contribute to algae growth. Start with that.....pick at the algae in the mean time and slowly start to get rid of it with each water change...you may have to cut a lot of the leaves off your plants as well if they are already infested with the stuff....ive been where you are though...its really a matter of getting your plants healthy...once they are healthy and thriving...the algae will go away.
 
ergo sum said:
Some how I get the impression that you are not very serious. Am I close?

Why do you get that impression?

And yes....no need for any salt.
 
Oh just a hunch. He doesn't seem to know what spot algae is, yet he wants beard and or carpet algae. Just a hunch.
 
ergo sum said:
Oh just a hunch. He doesn't seem to know what spot algae is, yet he wants beard and or carpet algae. Just a hunch.

Hes learning....doesnt mean hes not serious
 
Yeh Im kinda a noob, but theres no reason to be a jerk LOL... I have always heard that spot algae is much harder to control than carpet/beard algae. And carpet/beard (when controlled) looks very natural and pretty nice. Is this totally off-base or what?

Anyways, in regards to the spot algae and the algae in the water... Im gonna stop dosing nutrients completely, and stop feeding for a few days. Anything else I should or should not do to get this algae under control? Should I do daily water changes (and how much) until I get the algae gone, or will that not help? Also, I know I could dark out my tank for a few days, however, my plants are kinda struggling right now, and I dont wanna kill them.
 
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