I grow in terrariums and I have spent a few years mulling over different options. I consider cost, availability of products, and aestetic appeal when choosing a tank.
I have gone with exo terra terrariums, because they are relatively cheap considering building one out of polycarbonate sheeting, they open from the front (a must in my opinion) and they clean easily.
I have not repurposed anything into a tank, but I would like to. If you do, consider sealing all exposed wood. Also drilling holes in the glass, if needed, for wiring, ect. (see youtube) Plus getting to the plants needs to be easy. A top loading tank is out of the question for me.
Also will you water in the tank or out. Fert? ect.
Humidty will maintain itself if the space has enough plants and does not have a high exchange of air. I have found it unnecessary to have constant air exchange. Plants grow well, humidity stays high. Mold and fungus is non-existent if air flow is continuous and adequate.
Regarding light sources you probably know your options. I have tried MANY. I still prefer HO T5's. I also like FirstRay's screw in LED's, and yes they are really affordable.
Please keep in mind the FC's you want and the heat that may be put off. I have chosen to grow with less optimal light for better temperature control, and my plants grow and bloom enough to satisfy me.
Hopefully you will find something accomodating.
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