Crack in tank

[Dearth]

we have lowered the tank water lvl and transfered a few of his less fussy fish into a 20 gallon tank but we dare not transfer some of the others as they don't handle switching environments too well and some are way too big for the 20 gallon and he wants to keep this tank going til he can get his old tank from his brother in Kamloops up to switch tanks and fish which should be by sunday