Re: arowana tank
I agree with Vassili: 100g is way too small for two arrowanas. Also, I don't think that protein skimmers are really functional on a freshwater tank, but I have an overflow & wet/dry filter on my cichlid tank and it works very well.
As for stocking, I would just stick to the arrowana and the pleco. As far as I know, some plants would be fine in a set-up like that, but leave mostly open swimming space.
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