100% Weekly Vs 50% Twice Weekly Options

[dragonhart]

hi,

is 50% twice weekly Equivalent to 100% weekly? what are the pros and cons? thanks,
jason.

[dragonhart]

thanks bro and sis for the replies,

i use to do 50% twice weekly(about 2-3 days in between WC) for a 4 feet tank(for the past 1 month) and 25% daily for a 2 feet tank. i just tried to do 100% weekly for the 4 feet tank.
i think need perhaps 1 month to see results.
long long ago LFS only recommend change 25% weekly and buy a big, expensive filter, no wonder my ranchus did not grow much.

cp and d_golem reinforced what i thought about water changes. Partial changes only dilutes the nitrates, let's say the tank has a nitrate reading of 40 ppm. A 100% WC reduces it to 0-5 ppm, changing WC 50% twice at one go(assuming no time for nitrate to accumulate) reduces it to 10 ppm(40/2= 20, 20/2 = 10).

btw my stocking is rather low...2-3pcs of 2.5 inch ranchu in 200L of water and i am only using two sponge filter.

so change 100% weekly but be very careful about adding of anti-chlorine and acclimatization to the new water.

hi,

is 50% twice weekly Equivalent to 100% weekly? what are the pros and cons? thanks,
        jason.