hi there and welcome to the forum , but i am sad to say i have some bad news for you
90g is totally unsuitable for either of the aboove fish and a single fish would easy outgrow a 90g in 6 months to a year , they grow fast
there are now well over 35 diferant species of snakehead , many that are suitable to your proposed tanks , unless you have a bare minimun of a 9 x 3 x 2 you really need to forget about them two species and also marulia