Also what size tubs would a Leopard Gecko need? (I think its 15q)
So you asked what the leopard gecko needs. What it needs can not be met in these tubs so that is why they recommended other. I'm sure you want your pets to be as healthy as possible, therefore requirements must be met.
Mindestanforderungen an die Haltung von Reptilien -Use google-translator is necessary.
http://www.environment.nsw.gov.au/resources/wildlifelicences/20130185ReptileCode.pdf
I will pull a few and post them here to make it easier for all to see.
3.1.1.1 An enclosure must be escape-proof.
Tubs are certainly not escape proof. I hear of escapes all the time and sadly some are never to be found again, at least not alive.
4.1.1.1 An enclosure must provide the reptile with sufficient space to move about freely, express a range of natural behaviours and avoid cage-mates.
Certainly not enough space.
3.3.1.1 A reptile held indoors must be provided with temperature gradients,
humidity levels and light cycles that are appropriate to the species (i.e.
allows normal physiological functioning and behaviour).
Heat spots only.
4.1.1.2 An enclosures must provide sufficient space for the maintenance of an appropriate temperature gradient (i.e. one that allows the reptile to thermoregulate).
Heat spots only.
4.2.1.3 An enclosure housing a single lizard that is
between 6 months and 12
months old must have a floor area of at least 0.03 m2
(e.g. 0.3 m x 0.1 m).
3.1.2.1 An enclosure should be designed so that the keeper can safely work in it and access the reptile.
Sorry guys, but not even a 20 gallon long is appropriate. The opening on top is a hazard. Geckos are dropped while owners reaching from above or geckos have been crushed with items from above.