I have a wet/dry filter and need some advice

I was given a wet/dry filter that was used on a 75 gallon tank and I was thinking about using it on my 20L tank to get my skimmer and filter w/ carbon out of the display and in the stand. I am still trying to decide what to do. My tank is not drilled and I dont really know if i could trust an overflow box that could lose suction. so i dont know if i want to get a drilled tank and use my display i have now or what. I am going to be upgrading alot here soon so im just not sure what do you think

 

i definatly think that you should have a overflow and a sump/refugium jmo

 

upgrade to a bigger tank and get it drilled, just get it over with.
I would not bother using the wet/dry just use the 20L you have now as the sump.

 

I have a 75 gallon tank sitting empty and would love to get that one going but the cost right now would kill me. im a senior in college so I was just trying to get me 20L upgraded and start keeping some sps and then get my 75 gallon going once i start my career and all.

 

if you can live with the equipment in there I would just keep it in and forget the sump save that for your next tank.