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 I live in a townhouse with the exact same wording in the bi laws.  I was on strata for years too.  When saying "reasonable" its totally subjective so you're actually pretty safe if you just set up a tank.  I have a 125 gallon with 8 fish currently, both are reasonable.  What they don't want is you to turn your garage into a fish breeding operation with 27 40 gallon tanks and 1000's of guppies or whatever.  That's not "reasonable".  They also don't want you turning your livingroom into a 20,000 gallon shark tank, that's not reasonable.  A regular saltwater aquarium that you can purchase at the store is reasonable.  If you put in a 250 gallon and someone on strata questioned it, you'd win, the bi law is to vague.  
 I myself thought 125 was probably the limit.  I don't need to reinforce the floor or anything like that, sounds reasonable.  If I was adding to the sub floor to support the weight of my tank, I may have crossed the reasonable threshold but would still probably win if I fought it.
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