Go to the store with as much information as you have (i.e.: dimensions of the inside diameters of the top, etc. ) As an alternative diy: a 4' shop lite from home depot fits a 55 long and you can get plexiglass (the thick kind to avoid sagging) and cut it to acomodate filters etc.
They do have glass lids for 55 gallon tanks depending on brand since each brand has a slightly different dimension
They sell tanks at reasonable prices yes. We bought a 50 gallon with cedar wood stand, filter and water heater got 325
No, sorry, petsmart does
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