Green Water

  • bserafin23
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bserafin23 created the topic: Green Water

I've been battling a persistent green water issue in my oscar tank. There are two many variables that happened and I'm struggling to pinpoint exactly what started the problem and allowed it to persist. The green water started AFTER the first round of breeding and egg laying. The eggs were fertilized and many of them hatched. Two days later the parents ended up eating all the fry. Any unhatched eggs were removed however some of them developed this white fuzz on them. I read this can be caused by being unfertilized and poor ventilation (female fanning the eggs). These eggs were removed and followed by a 15% water change. The next day there were still some of the white fuzz eggs hiding amongst the plants and the first evidence of green water. Small water changes were performed for the next couple days and my assumption was a possible phosphate bloom. We re-installed the chiller on this tank because water temp jumped to 81 one of the days. (Maybe chiller had some residual algae left in it from before? )For the next week water changes were performed and light was either turned on for just a few hours or left completely off . I became more aggressive with the water changes by doing 40-60% water changes. Still very green water. I added a poly filter 3 days ago and have still seem no improvement. Light has been off pretty much every day this week but one. I tested again for phosphates but test resulted in a reading of zero. Also my plants are THRIVING. This tank does receive some morning sun but it has had this spring/summer sun for the last 5 years and never this issue.

Other water chemistry

pH: 7.0
NO2: 0
NH4: 0
NO3: 20
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Suprd71 replied the topic: Green Water

81 is an ideal temp for Oscars. Nitrate should not be above 20 and fish will do best with an average closer to 10. Nothing but benefit with an aggressive water change sched. 2 Oscars imake a huge bioload. You may have an elevated TDS level. What is the condition of the bio media? Gunked over, need some cleaning?


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gorgoroth replied the topic: Green Water

add more plants :) they will compete for the nutrients in the water with the algae. micro algae can also be removed by a UV-filter if you don't mind adding this to the system.

160 gallon south american
190 gallon malawi
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bserafin23 replied the topic: Green Water

Bio media is not gunked over. I dipped it to clear any excess debris that may have been present a week ago. Still doing water changes but going to try to take apart chiller and see if there was anything that got clogged in there the last time it was uninstalled. UV sterilizer is an idea. We have never had this issue before so was hoping to clear the water without having to make that investment but may not have a choice! Thank you!
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DRACO replied the topic: Green Water

most of my tanks are exposed to sunlight for more than 6 hours a day..
they stay clear from the time my filter media comes to an age...

add more fiberwool to catch the suspended particles and do water changes regularly..
water will clear up once your medias becomes matured
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