This is one of the tanks we have installed it is 6'x2'x2' and is mostly stocked with Catfish.
The owner is disabled and can't do the relevant maintenance needed on it anymore and so we now do it for him.
Note the sand at the bottom great for catfish to dig into and it doesn't damage their barbels.
This tank holds 150 gallons of water and we do a 75 gallon water change on it once a month.
This tank is a bit smaller at 4'x20"x15".
It is full of guppies and other livebearers and as they're prolific breeders, it houses alot of fish so the water can get quite dirty.
The owner is a mature woman who also struggles to do her own maintenance so we now look after this tank also.
This is my girlfriends tank.It is a very small tank.Small tanks need lots of work to keep the water in good health, as they have too little water to dilute any impurities.
.