I have a 29g BioCube, its a nice tank for beginners...but as you start to know more and learn more...then you need more, such as skimmer, MH light.
For me, after several months, things just seems to be a little too crowded in my tank.
If you still have space in your place, imo better to get 50+ gallon tank
Crowded...you just need self control no more..one more frag can't hurt
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I once had a Big tank...I now have two Huskies and a coyote