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I have an old aquarium that is about 75 gallons, I think. If I put my seed trays in it and use the grow light, will I have any problems? Maybe too hot? No air circulation?

Anyone try this?
 

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I don't know if I would set the seedlings down inside it. You want very good airflow around seedlings to prevent damping off diseases and to promote good leaf transpiration.

I use a small fan, set on low, a several feet away from my seedling flats. After the seedlings put in their first set of true leaves I put the fan on them for a little while every day. Not blasting them with it, but situating it so the plants just barely move. This is to help strengthen the stems. Now some people believe in doing this and some don't. After a few decades of starting my own seedlings I believe it does strengthen and slightly thicken plant stems.

If they were down inside an aquarium, they wouldn't get much air circulation and disease and improper transpiration would be my biggest concerns.

However, do you like rooting cuttings? If so, and aquarium is excellent for that purpose. Everything from easily rooted flowers and herbs to woody plants like fig tree cuttings root very well in an aquarium. You can either set your perlite/rooting medium filled pots down in or as I've done when rooting impatiens, coleus and figs, I put a 6" layer of perlite in the bottom, dampen it, and stick the cuttings directly in that. Put the lid on and check daily, opening the lid for a several minutes a day to promote healthy air exchange and to check moisture, and then put the lid back on. I still have a couple 10 gal. aquariums in the greenhouse I use from time to time.
 

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I use big clear storage tubs, it works great. I was going to start a thread, I just started germinating my seeds in wet paper towels and will probably be transplanting in a week or so to the pots. I am starting my Cali Wonders earlier this year since they take longer to grow.

I also run a fan on them but only for an hour or less a day. You have to be careful not to keep the soil too damp or you will get mold growing on the soil.

There is more to my setup, I will get into more details when I get it set up.
 
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