05-02-2013, 08:33 AM
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Most kits come with cheap parts. Cheap filter, cheap heater, standard lights. There is nothing wrong with glass, most tanks actually are. Glass only breaks if you hit it with something, or if it got damaged in shipping. Acrylic actually scratches really easy, so you have to be far more careful with it when cleaning. If the glass is too thin, it can bow out a bit, but usually that isn't a big concern.
For a 20g the best tanks are the ones in the long configuration. Tank length is more important than depth for most fish. I have a 20g tall, and really wish I had gotten the long instead.
For lighting, I don't know how that stock LED one will work for you. Little is known about LEDs and plants right now as it is a fairly new thing. People have had good results with the Marineland Double Bright LED fixtures though. I build my own LED fixture that seems to work okay but it is far brighter than what I've seen sold for fish tanks.
At night I would not use that blue light. Fish need periods of darkness to sleep just like humans do.
For a filter on a planted 20g tank, you can't go wrong with a sponge filter. They are usually pretty cheap but most big box pet stores do not carry them (they'd rather carry the more expensive filters with higher profit margins).
You can try the LEDs and just see how they work with some plants. Otherwise:
If this is a 20g tall, for lighting you can go with either a single T8 for low light, a single T5HO (if you can find one, most are dual light fixtures) is a good amount of light, or you can do dual T8 which would be on the high side of moderate lighting. Dual T5HO would be way too much light and you'd end up with an algae farm unless you did CO2 injection.
If it is a 20g long, a single T8 would work well.