at one point i had a 10g, 20g,30g, 55g,and 125g going but was way to much of a PITA doing 5 water changes, feeding, testing ect. and all seemed to get neglected but my reef tank which at the time was my 55g.... when i bought the house im in now i narrowed it down to just one nice tank to focus all my time and $ into and i think that was the best thing i could have done!
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125g Reef 72x18x22 - 250w mh's, MR-2 skimmer with panworld 150, Koralia #3 & #4,
Phos reactor/rowaphos, ATO, DIY overflows, DIY 55g sump with fuge...
300g back in the works!