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 Post subject: Algae buildup (Green)
PostPosted: Jun 12th, '19, 07:58 
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Hello all,

I have a 1000 litre tank for my 7 rainbow trout with a grow bed on top of it and a sump tank with pump in it that receives its flow from the fish tank. The pump pumps water to the grow bed and runs a venturi setup in the tank.

But I have been unable to get to the tank because of the grow bed on top so I am looking for a new design. (Any suggestions would be greatly appreciated)

However my biggest problem at the moment is that the tank now has a green tinge to the walls and water (Yes, I know I should have painted it, or covered it but I was slack) I now have some mini orb cladding to go around it when I get the grow bed off it. My fish seem to be still feeding ok, not that I can see them at the bottom, but I certainly see them when I throw food in. I have just got 5 x 50mm uniseals to increase the pipework and get some better flow happening (presently all fittings are 40 mm. But as luck would have it, it is pouring rain for the next day or two.

Anyway after that long winded feedback, my question is
Will the algae harm the fish? Will they survive for a few more days? I know it is not ideal but I cant do much in the short term, short of getting another tank and putting them in there till I sort things out??

Regards
Rod

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PostPosted: Jun 12th, '19, 08:19 
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The algae can be a problem, it depends on how much there is.
the risk is related to oxygen levels at night when algae respires, lowering the oxygen available to the fish. If the algae dies, which will happen when you block its light, it will decompose and use up more oxygen. This might not cause much of an issue to some kinds of fish, but trout like clear, well oxygenated water.

How quickly has the algae developed? What is your nitrate reading and temp?
If the water is relatively warm, and the nitrates are high, with the long nights you must have over there at this time of year it could be a critical situation. If this is the case i would do water changes and plenty of aeration, especially late night and early morning. As well as cladding the tank of course.


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PostPosted: Jun 12th, '19, 09:15 
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Thanks Danny,
The algae has been building for say 4 weeks and has just got bad in the last week. I have plenty of oxygenation I am sure. the water is bloody cold (winter here, and we are averaging 12 in day and 9 or so at night. I havnt tested water for a while but will do so today if the rain holds off for a bit
I will come back with readings
Cheers

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PostPosted: Jun 12th, '19, 11:18 
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just tested water and PH is up above 7.6 (always has been) ammonia is at 0.25ppm and nitrate is 5 ppm

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PostPosted: Jun 12th, '19, 16:14 
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Sounds good, you're probably fine to just clad it up and let the algae die back.It's goo that there's rain, so you can exchange the water if needs be, just in case it gets a lot greener.


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PostPosted: Jun 13th, '19, 03:44 
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I have rarely run into issues with surface algae harming the system or fish, as the fish in the system usually graze on the algae and keep its populations in check. I am not sure if trout do this, but if they do not, it may be worth introducing other organisms that can graze on the algae that will not be attacked or preyed upon by the trout. I have used snails for this purpose (although fish will eat them) and have also considered introducing Plecostomus in the past.

Suspended algae should never be present in a system in noticeable quantities, but it is easy to deal with using a UV clarifier/sterilizer. An appropriately sized one will remove all suspended algae within a few days.

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PostPosted: Jun 13th, '19, 03:46 
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Also I am worried about your pH and ammonia levels, I would reduce your feeding so that the ammonia clears! From my understanding, trout are very sensitive to impaired water quality, and the toxicity of ammonia increases proportionally to pH.

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