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I would say that the glass top is really dependent on the fish you have as well as preference. I have had glass top on and off and have not noticed any significant difference in the rate of evaporation (but this will vary greatly with temperature). Some fish are jumpers like hatchetfish so they need a top. I personally prefer it without a top.

An inline diffuser and DIY CO2 should be fine for a 20 gallon tank in terms of getting the CO2 levels high.

As for the eheim, can't help you there.

good luck!
 

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I keep reading that it reduces the lighting by something like 7-10%...Hoppy, the resident light expert here did some tests and those were the numbers if I recall correctly.
 
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