DonW
R.I.P.
Take a closer look at ph early morning and mid day. This will give you a good idea whats happening as far as organics.
Don
Don
What happened after you "washed" the rock? Any change? I am curious because I am having a similar problem however my tank is probably not nearly as stable as yours yet.
LOL!! That's why I love high flow so you don't have to worry about doing that all the time. That detritus that settles on the rocks, fuels algae which is why people recommend blowing them off every day or so if your flow doesn't do the job for you. I fought with dropping my nitrates from 10ppm to 0 and it took months! You are almost there so just keep up with your water changes and keeping things clean and give it some time
Take a closer look at ph early morning and mid day. This will give you a good idea whats happening as far as organics.
Don
I have a pinpoint ph monitor an I always look at it. Morning ph 7.97 afternoon 8.15-8.22 could you explain the organics thing to me?
scott
As the organics rot and /or get used co2 will be produced causing a ph reduction. If you take some water outside and see a ph increase then you have co2 issues. You can either blame it on your house being to closed up or organics. Most of the time its organics and not the house.
Don
Don I tested the water outside there was a ph increase.What can I do about the organics??
11 months is about enough time for the nutrient buildup in your sand to start leaching back out to fuel nuisance algaes. Probably organics as much as anything. Salifert makes an organics test ket. Somewhat qualitative rather than quantitative, but if you register anything, not good. You could also try running some carbon.
Put some carbon in a media bag and put it anywhere in the sump where it'll get a lot of flow.
Keep in mind that some forms of phosphates don't show up using test kits. If the phosphates are bound in the substrate or rockwork, it won't show up doing normal tests. Test water that you pull from a hole in the rock or dig a shallow hole in the sand and test water from there. You may find different results. What kind of algae are you having a particular problem with? That will go a long way towards helping to figure out the best way for you to combat it.
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