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Old 05-14-2018, 04:49 PM   #1
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Rampant BB algae and cyano, help!

For a couple months Iíve had issues with black brush algae and cyano, and itís growing rampant and thickly all over the tank no matter how thoroughly I clean it. Green algae is also growing quicker, but the BB algae is out of control. The last two times I cleaned the tank I pressure washed the decor and replaced almost all of the water and still it comes back immediately and covers everything in thick layers, and itís nearly impossible to scrub off. I have lived in the same place for 2.5 years so the water source hasnít changed (to my knowledge); when I check the water levels, the chlorine levels are a tiny bit high when I put in fresh water after cleaning but nothing crazy, but even when the rest of the water levels are in the appropriate ranges, it doesnít make a difference. Does anyone have any ideas why this is happening and any solutions to get rid of it or at least slow/cut down the growth?

FYI: 48 gallon cold water tank, goldfish (no recent new additions), average temperature 72 F (its been that way for years and we canít get it any lower in the summertime so we keep it constant year round to avoid fluctuation; theyíre used to it and this has been the case before the algae epidemic).
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Old 05-14-2018, 06:37 PM   #2
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1) Reduce light to ma 6 hours a day, and dim the light down if you can.
2) Ensure no sunlight is reaching the tank.
3) Remove all organics from the tank (mulm/crud in the gravel/sand plus clean the filters out every other week).
4) Increase water change size + frequency.
5) Load up the tank with floating plants.
6) Increase flow in the tank
7) Don't slack on the elbow grease, manual maintenance is a great tool.

Practice these and it should get easier.

also try:

1) Blackout the tank for a week.
2) Chemiclean for the cyano.
3) Nuke the tank with the algae "one - two punch"
4) Ensure you are properly treating the water, ANY chlorine is BAD
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Old 05-14-2018, 08:01 PM   #3
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One Two punch ! +1
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Old 05-15-2018, 01:26 AM   #4
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Lights shouldn't be on for more than 2 hours at a time. I'm guessing your lights are on for about 12 hours straight every day.
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Old 05-15-2018, 02:24 AM   #5
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Thanks for the tips! The lights are on for 7-8 hours a day and there is no sunlight directly reaching the tank, but Iíll try blacking it out after the next clean/change and see if that helps and stock up on some floating plants. The 1-2 punch treatment looks intense but may be what is necessary, Iíll do some more research. Regarding the chlorine, are there any additives I can put in to bring it down? With water changes I put water conditioner in but nothing else.
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Old 05-15-2018, 02:46 AM   #6
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If you have no live plants, start by turning your lights off entirely, except when you want to look at your fish. Restricting your lights on time to a couple hours at a time will help prevent it in the future. A $5 outlet timer makes this approach very simple.

Would recommend treating for it, light control only takes months for it to die.
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Old 05-22-2018, 12:40 AM   #7
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Seachem Prime is a good product for helping with Chlorine/Chloramines in tap water but also does a lot more
Seachem - Prime

I just did a Cyano scrub and lights out for 3 days on my nano SW reef and so far I am impressed. Light feeding and skipped one day and fed very late on the last.

You have likely high organics because GF are such heavy, and sloppy eaters.

Purigen is also a useful addition
https://seachem.com/purigen.php

Both of these products are top things I recommend because they work really well. I use/have them for all my tanks. There are other similar products but I have not tried them.
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