I am looking for a tank anywhere between 40-55 gallons for my African clawed frogs. My last little baby, gotten in August, turned out to be a female(finally!)and her growth rate has shot thru the roof! She's now far bigger than all 3 of my males, plus at the age where eggs could be a factor any day! With her help, they have outgrown their current 29 gallon tank. Would like to find something used if possible before I check out prices of new. Thanks!