Is it the Nitrate or something else?

BeckyWoods

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Something is off in my tank but I am unsure what it might be, tested PH, ammonia, nitrite, and nitrate. The nitrate might be too high It is around 10ppm. I do not know the normal levels don't test as much as I should. Last time I tested maybe a couple of months ago everything normal, nitrate not 0 but maybe like 5ppm max.

I'll be honest I am sorta a lazy reef keeper but I have had this tank for 5+ years, haven't changed stock in it in like 1-2 years besides adding clean up crew here and there. Do a water change like every other month... should I do it more often prob but life is busy and my tank has been thriving. Coral growing great, haven't lost any stock, and the clownfish even started laying eggs a month or two ago. I feed every other day. I haven't changed anything I do in the past 2 years. But few days ago noticed the sea anemone wasn't looking full and started to move, some corals not looking so great a day or two ago, and my sea urchin started to die (tho it was old so could be water quality or just its time or both I guess). And i noticed more, I think its called, hair algae growing. So did a water change (~40% this is the normal amount I do each WC) last night but when got home from work today the tank just doesn't look good, semi-cloudy, and coral looking very poor. (Pics attached).

Water changes: Every 1-2 months. Get RO (i believe) pre-mixed salt water from local reef store (been doing this for years) as I have well water at my current house. Dose w/ iodide and essential elements per reef store recommendations because I guess the water I get from him doesn't have? I top off the tank with semi-filtered well water/distilled water between water changes.

Tank: 20 gallon, pump and small wavemaker, small skimmer (tho now i think about it it was off this past month because it didn't want to work but haven't always had a skimmer ether), 6 fish (2 clowns, 3 green chromis, 1 watchmen goby), pistol shrimp, sea anemone, some snails, 8 coral covering decent portions of my rocks - not sure what all the names are but have a few LPS, zoas, maybe some goniopora, and whatever the flat orange (or was orange) coral is in the photos.

It could be the well water i top off with? I know my well water is high in iron and I do think my water softener isn't working as well however I do have a secondary filter on it and my tank is covered so really doesn't need topped off much. Maybe I'm over feeding some? Maybe my skimmer was doing more than I thought? I did mess with it and got it running again.

Guess my question is what do I do now? I did ~40-50% WC last night and I don't want to do another one so soon.

Will try and take a water sample to the fish store tomorrow he prob has a my extensive testing kit. Maybe the skimmer running now will help maybe ill look better in the morning?



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6 fish in a 20 gallon is a very high bioload, the skimmer was turned off for a month and infrequent water changes, and using semi filtered well water... it sounds like this has all been building up for a while with a combo of different things.

I don't think its about overfeeding I actually think your not feeding enough, I feed my fish 3-4 times a day and I have no algae.

If your looking for the insta fix, then you can try things like vibrant or some other algaecide, otherwise it will take a couple of months of diligent cleaning and nutrient control IMO. Good luck
 
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Have you tried manual removal of the algae?
 
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Mojo is on to something, it sounds like it is a bit of a perfect storm scenario.

Smaller tanks tend to have issues magnify themselves as well.

Unless you matched the alkalinity of the tank with the water change water you could have very well shocked your tank with an alk spike. Plus the dying urchin...

Well water, you didn't indicate if you have a RODI system or not, well water is almost never safe for reef tanks if not treated.
 
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