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Old 09-02-2009, 01:34 PM   #11
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We have a variety of reef fish (yellow tangs, clown fish). We feed once daily. Yes we have some corals. Our pH is at 8, nitrates near 0, we still need to test for phosphates.
Question: Would bio balls have any significance to algae build up?
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Old 09-02-2009, 04:16 PM   #12
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Originally Posted by utdental View Post
We have a variety of reef fish (yellow tangs, clown fish).
I'm asking for your stock list because I'm trying to figure out if you're overstocked. A "variety" of fish just doesn't help us much. How many? What kind? If you're overstocked, that often leads to water quality issues that cause excessive algae. And if you're overstocked, it really makes it tough to get your water quality in line.

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We feed once daily. Yes we have some corals. Our pH is at 8, nitrates near 0, we still need to test for phosphates.
Question: Would bio balls have any significance to algae build up?
Nitrates and phosphates are "fuel" for algae. Even though you have zero nitrates, I'd guess that's either an incorrect result, or you have enough algae that it's consuming the nitrates as fast as they're produced. (If that's the case, your phosphates will probably be zero also.) Only doing 10-15% water changes once a month... you're going to have nitrates. Bioballs aren't necessarily a bad thing, but they can pump a lot of nitrates into a system depending on the maintenance of the system.
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Old 09-02-2009, 04:25 PM   #13
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We have one yellow tang, one striped moray eel, 6 damsels, 1 hawkfish, 2 clowns, one angelfish, one blue tang, an assortment of crabs and snails, couple mushroom coral, green carpet anenome.
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Old 09-02-2009, 04:34 PM   #14
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Oh my.

I'm normally the conservative one around here about stocking, but I think most folks will agree that you're definitely overstocked with a 75g. Not sure if that angelfish is a dwarf one or not, but either way... too many fish. And that eel really want to be in a bigger tank.

I'm afraid whatever you do with regards to getting rid of your algae, with that many fish you're just going to be fighting a neverending battle. That's just a big bioload and it's just naturally going to create a lot of "excess nutrients" (nitrates) that algae will gladly consume.

Obviously some folks might have other ideas, but I'd say that you should probably reduce the fish load by 1/2, and start doing water changes weekly - or at most once every 2 weeks. Or learn to love the algae?!
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Old 09-02-2009, 04:40 PM   #15
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Oops. I misread that original post. You have a 210 gallon... not a 75g.

OK... so ignore what I just wrote! You're OK with what you have in there... not too many fish. But I would expect that the moray is a pretty messy eater and big pooper. And with only one water change month, that's probably the source for your algae food.

I'd suggest going with the easiest things first - increase your water changes to weekly until you get the algae back under control. Start using RO/DI water. And manually go in and prune back/rip out whatever algae you can. See if the increased water changes don't slow down the growth.
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Old 09-02-2009, 06:11 PM   #16
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Great advice, thanks. We purchased an RO filter and will begin weekly water changes for awhile. We currently try to manually remove algae as you suggest. We will see how things go.
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Old 09-03-2009, 07:12 PM   #17
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Okay, RO/DI filter came today. I have the option of running RO water or a RO/DI water combo. Which option should I use?
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Old 09-03-2009, 07:20 PM   #18
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RO/DI is the best option.
You can also slow down on the feeding. I'm not sure about the eel, but the other fish can be fed every other day.
What and how much are you feeding?
I feed every other day and sometimes skip an extra day, and have had not ill results in quite a few years.
Any chance you can post some pics? I'd love to see a 210G with those critters!
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