Crypt like plants? You mean the purplish plant in the bottom right of the photo with the discus? That looks like Lobelia to me. One of my favourites. They'll lose those purple leaves and grow bright green aquatic leaves. Nice for mid ground or even foreground for deep tanks like this one.
Where do you buy your plants?
I used to cover my newt tanks with acrylic or glass covers. Whenever I open them after the lights are on for a few hours, there's warm humid air inside. My guess is that the trapped heat will either transfer to the water or at least make it harder for the water to cool down. I opted for the wire mesh for planted tanks to allow air circulation and use of fans for cooling the water. I think it will block less light then acrylic or glass. Might be negligible to the naked eye though. In the long run, acrylic will craze and dried water splashes will leave limescale which will definitely block some of your light. Its hard to clean off limescale without scratching.
Here's the photo of my covers.
Front edge secured with Gear Tie. Can find at Home Fix. The rear edge is tucked under the return pipe.
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