fish tank comes with a few bits . i have down graded to a smaller tank the base had a crack about 3 years ago i forgot to put some polystyrene foam under . so it has been sealed and been fine ever since. hence only £25 pound.
the crack was across the base when it happened about 3 years ago . so my hubby put clear silicone sealer over it an its been fine ever since and you dont ever see it Because it get covered with gravel anyway .