I would put a 10gal fuge in for your 20gal tank. but thats me. Just use a rubber maid container for a fuge easy to drill if needed.
I have a 75gal tank and i see my mandrian out and my sixline out they swim with each other. Never seen a problem but then again all my fish swim with each other just like they are all hand fed.
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75gal RR Tank with 2 Seio 620 and 2 maxijet 1200, 2 150watt HQI and 2 Antic PC, Turbo Floter Skimmer with 9.5 Mag to tank and fuge, Sump is 75gal with a 22gal fuge, 40gal Auto topoff.
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