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I dose EI ferts 10ml per day (followed instructions). I do 50% water change every week so I'm not sure what else to do.
Hi @Captain Ahab

My suspicion is that the problems you are seeing are caused by excessive light and excess nutrients/ferts. I don't follow the EI Method. I prefer to minimize surplus nutrients in my tanks. And that means measuring nutrient concentrations using water tests. For me, that means nitrate and phosphate followed possibly by other tests. Some people prefer other approaches - whatever works for you.

The light is on for 6hrs a day but at 100% because its an older model which isn’t dimmabl.
Just spotted the above. This is going to be a major problem. You are almost certainly flooding your tank with way too much light. I suggest you tackle this first, then consider the nutrients.

Anon
 
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