the good thing about this small tanks is the ability to overfeed and use water changes. its more for tanks under 5 gallons, but you can apply the same rules to tanks under 10. just takes more effort.
for instance, depending on your setup you can put a sealed lid on it (removable) to prevent evap and have better stability than larger tanks. you can do 100% water changes weekly and once a year you can do a system flush. basically you can forcefully do a water change of 10-20x the total water volume which flushes all nutrients, detritus, and nutrient build up within the rocks and sand. as I said, its a lot easier on tanks less than 5 gallons but very possible on tanks up to 10. each time you do the big flush you reset your tanks clock. it can completely prevent old tank syndrome, remove any algae or bacteria (cyno/dino) and give you a fresh start without having to rip apart your system.
while doing any of the things I listed above comes with other instructions on how to do it safely, it can all be done in your 8 gallon tank and would ensure a long life. this is how people like Brandon maintain a 1 gallon tank for 9+ years with minimal maintenance.