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Is there a way to completely rid of it in your tank for good, without dosing with excel all the time?
Yep, simply concentrate on giving the plants what they need, light, CO2, NO3 PO4, K and micros. For some reason, in a tank with healthy plants there is very little algae. As we all know, life sometimes gets in the way and we have to neglect our tanks. When this happens, manual removal always works best but most people don't have the desire or time to manually remove it when Excel or gluteraldehyde work so well and are so easy.

To manually remove thread (and hair) algae, get in there with a toothbrush and twirl the thread algae on the toothbrush. Get your ferts and CO2 in order and the plants will soon start to outgrow the algae. You will need to get in there daily, maybe twice a day with the toothbrush but it does work. Once you have healthy, algae free growth on the upper portion of the plants, prune them, keeping the algae free tops, and replant them.

Spraying Excel or gluteraldehyde on the plants while they are out of the water does wonders and saves quite a bit on dosing/overdosing with Excel. Spot treating with Excel also works well.
 
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