Lighting on a 65 gallon tank - The Planted Tank Forum
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post #1 of 3 (permalink) Old 02-02-2020, 12:12 PM Thread Starter
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Lighting on a 65 gallon tank

Hey there, I got a 65-gallon tank a while ago and it's cycled, but it's still growing diatoms like crazy? I can clean it and they will be back in a couple of days it's pretty crazy, this tank is really tall, taller than ones I've had in the past so I wonder if it's some sort of lighting issue, I've looked around and the light I got with it looks like a 36" version of this light what do you guys typically do with deep tanks like this lighting wise? The light is 26" from the bottom. I tried running longer hours 10 with a mix of high/low light settings, now I'm doing 8 hours of the low light setting, but still, the diatoms are flourishing. The next step is all high light for 8 hours I guess. The tank is a bare bottom and I have a couple of medium-sized anubias barteri in there attached to a couple of pieces of wood, don't seem to get any growth on them, I'm just dosing flourish btw. Just curious what any of you have to say about it.
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post #2 of 3 (permalink) Old 02-13-2020, 07:58 PM
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I am no expert but I can speak to my own similar experience for what it's worth.

I had a significant diatom problem which was continuing 3 months after my tank had been fully cycled (90 gallon). I read that they usually burn themselves out a few weeks after the tank is cycled. So I switched from a Fluval 3.0 plant light to UNS Titan 1, which is a much brighter light with a more ideal spectrum, and the diatoms disappeared almost overnight. If you want to purchase a new light I would suggest checking around the forums and see what people recommend for popular lights. Though I do know that anubias doesn't need much light to thrive so it may not be worth it.

You may be able to get more advice from others if you post the following: how long has your tank been cycled for? Current ammonia, nitrite, nitrate readings, specifics of the light you have (incl. spectrograph)
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post #3 of 3 (permalink) Old 02-13-2020, 08:13 PM
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If it's truly diatoms you just have too much free Silicates.

Commonly found silicate removers also remove phosphorous.. except one..
Not sure of the real effectiveness..

"A man with a watch knows what time it is. A man with two watches is never sure."
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