30g tank protein skimmer

doesnt hurt, not necessary if you keep up with water changes that should suffice , if you want peace of mind (like i did) you can get an HOB or in tank , i myself went with hydor in tank skimmer , works like a charm and was one of the cheapest (with good reviews)
 
+1 On Hydor slim skim, I also have it. Just make sure you have enough room for it though, since it is quite high ( the normal one).
Maybe you could try the nano one if the other is too big.
 
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