I would say <u>most</u> of the <i>Odatria</i> subgenus rather than "<u>all</u>", would be suited to live in a 75 gallon tank.
Also bear in mind that although that size tank may be suitable for an adult (of most dwarf species), they will make <b>good</b> use of any amount of pace you could give them and multiple animals would require a larger enclosure for sure - with the exception of <i>V. storri</i>, <i>V. gilleni</i>, <i>V. caudolineatus</i>, and possibly a pair of <i>V. acanthurus brachyurus</i>.
There are a few other dwarf species that are small enough that multiple animals could be housed in a tank that size but I did not mention them as they are not as available as the few species I mentioned.
Personally, I would not suggest keeping any "tree" monitor in a tank that is only 18" tall without substrate.
To give you a more specific suggestion, I would say a Yellow Ackie would fit the bill for you. They remain quite handleable, are very "friendly" and truly a joy to keep.
Best wishes,
__________________
www.NiagaraReptiles.com
|