Techniques for water change on large tank
I have a new 75 gallon tank. It will be planted with play sand substrate, and have Fancy Goldfish / bristlenose Plecos, Eheim 2217 canister fiter, and and Aquaclear back-up filter. That said, i want to know how people do water changes on such large aquariusm, say i need to do a weekly 25 - 50 % change (depending on final load of fish)? Honnestly, i wanted to use a hose and tap water, and only after to add the Prime to the aquarium, but i dont know if that would kill the good bacteries even if the fitlers are off. Otherwise, how do you handle such a large change? Thanks in advance.
In my 75G I do water changes the same way I did in my smaller tanks. A python or some other siphon system is really a must for a tank this size. My order of operations is;
Connect python to sink
Drain tank 25-50%
Add Prime and move plants if necessary
Turn on python and refill tank
It shouldn't bother your bacteria when you change the water and odds are even with a 50% change the filter will stay running and generate a waterfall on one side of the tank.
Using sand in your tank you might want to put a bucket under the syphon output in the sink to catch any of the sand you might pickup.
I do the same as Dr Nic although I do shut my filters off while I change the water... in some cases the water level drops below the intakes so for me this is a requirement.
300 gallon mega tank
: build in progress
75 gallon community tank
: tetras, danios, corys, platies, otos, pearl gouramis, bristlenose pleco, assassin snails, red cherry shrimp, bamboo shrimp
70 gallon growout tank: clown loaches, sailfin pleco
60 gallon goldfish tank: fancy goldfish
29 gallon frog tank / 10 gallon tadpole tank
: 1 leopard frog, 1 tadpole
10 gallon and 5.5 gallon betta tanks: 1 male betta each, sometimes snails
I also make sure to unplug my heaters to avoid any issue when they go uncovered.
FW: 1 45gal, 1 40gal, 3 10gal, 3 30gal all community tanks of different species
Sw: 1 55gal, 1 30gal show, 1 29gal show, 1 20gal and 2 10's
I forgot to mention that but I totally agree. I'm running a room-temp setup at the moment so for me it's not something I have to mess with.
Originally Posted by Sandz