Thanks! personally i don't really like all-in-one tanks.. main issue is that im going budget.. those all in one tank are usually much more expensive.. (for this case the LF34L cost around $120 if im not wrong). Many have suggested that such small tanks do not require skimmer.. just do weekly water change (increase frequency of water change if bioload increase). for me i hope to use prodibio nano kit, rowaphos, purigen and goodbyepo4 to keep nitrate and po4 at the minimum..
Since my tank is inside my 422's cabinet, i do not have the space to have one more skimmer too.. Hope this helps!