we have the same when treating injured native animals
you could almost say this is the same as the vet sending you home with a course of antibiotics for your pet
one of the local native keepers here lives with no power
he has the tank set up outside in a shady area with good airflow
he has 2 200 litre containers as a header tank
he fills these once a week and slowly lets it trickle through the tank for a period each day
collects rain water as well in the tanks with an overflow for excess
has now setup a generator and pump to pump up to the header tank when needed
has been running for 18 months no problems so far
google pigeon loft or dovecote, plenty of plans out there
they will need to be homed into the new aviary if you are going to let them oout to fly around
they can annoy the neighbours by landing on their rooves
they can be messy sods
the term safe is dependant on many variables
give any filled glass tank a good whack with a sharp, hard object and it will break
best definition might be acceptable risk
i have a tank of similar dimension
the end brace is about 8 cm away from end to allow pipes for external filter
been like that for 3 years
you could remove and replace with triangle shaped braces across the corners