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post #1 of 5 Old 08-09-2015, 02:33 PM Thread Starter
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need help alge

hey guys i need your help i have a 40g saltwater tank with live rock and coral. for the first three years it went smoothly no problems. now my livesand and live rock are starting to grow mossy green/dark green alge on them. the internet says its cyano bacteria but i dont know how to get rid of it. i keep changing water, adding a phospate remover and vacuuming out the green stuff but it keeps coming back any help please

thanks
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post #2 of 5 Old 08-10-2015, 12:15 AM
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Can you get any pictures of the stuff, most cyano bacterias in the home aquarium are the red slime but there is a similar green slime. If it is cyano I have had good results with the Chemiclean product, it is an oxidizer of sorts. You could also try some carbon dosing such as NoPox.

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post #3 of 5 Old 08-10-2015, 11:21 AM Thread Starter
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hey thanks for your reply. it is a drak green slime almost similar to the red alge. i was thinking would a uv light help kill this bacteria? ill also look into the chemiclean products that you said.
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post #4 of 5 Old 08-11-2015, 12:10 AM
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Unfortunately the UV light will only help with the things that are water born and if it is what I think it is it can simply spread via patches. I presume you have increased your flow, that always helps to combat nuisances like this.

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post #5 of 5 Old 01-23-2016, 10:57 PM
Sounds like your rocks have filled up with phosphate. This may help...

Nutrient Export

What do all algae (and cyano too) need to survive? Nutrients. What are nutrients? Ammonia/ammonium, nitrite, nitrate, phosphate and urea are the major ones. Which ones cause most of the algae in your tank? These same ones. Why can't you just remove these nutrients and eliminate all the algae in your tank? Because these nutrients are the result of the animals you keep.

So how do your animals "make" these nutrients? Well a large part the nutrients comes from pee (urea). Pee is very high in urea and ammonia, and these are a favorite food of algae and some bacteria. This is why your glass will always need cleaning; because the pee hits the glass before anything else, and algae on the glass consume the ammonia and urea immediately (using photosynthesis) and grow more. In the ocean and lakes, phytoplankton consume the ammonia and urea in open water, and seaweed consume it in shallow areas, but in a tank you don't have enough space or water volume for this, and, your other filters or animals often remove or kill the phytoplankton or seaweed anyway. So, the nutrients stay in your tank.

Then, the ammonia/ammonium hits your rocks, and the periphyton on the rocks consumes more ammonia and urea. Periphyton is both algae and animals, and is the reason your rocks change color after a few weeks from when they were new. Then the ammonia goes inside the rock, or hits your sand, and bacteria there convert it into nitrite and nitrate. However, the nutrients are still in your tank.

Also let's not forget phosphate, which comes from solid organic food particles. When these particles are eaten by microbes and clean up crews, the organic phosphorus in them is converted into phosphate. However, the nutrients are still in your tank.

So whenever you have algae or cyano "problems", you simply have not exported enough nutrients out of your tank compared to how much you have been feeding (note: live rock can absorb phosphate for up to a year, making it seem like there was never a problem. Then after a year, there is a problem).

So just increase your nutrient exports. You could also reduce feeding, and this has the same effect, but it's certainly not fun when you want to feed your animals :)
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