Yesthrujenseyes said:Good to know!!! And yes they sure are super tiny (endlers).
So you did a 50 % water change weekly on the little edge? (Once it was all properly cycled).
First, larger water changes keep the water near to what comes out of your tap so, if if you have to do a big water change in an emergency for any reason, you don't have to worry about shocking the fish with different water.
Secondly, big water changes help keep nitrates low, and replenishes any minerals that have been used up by the plants (and, to a lesser extent, the fish themselves).
Some fish produce hormones that stop them growing properly, once they reach a certain concentration, so water changes help keep those down too, so your fish don't become stunted.
Lastly; unless your tank is old and neglected, and you make sure the new water is temperature matched and dechlorinated, you can't really do too many water changes, or ones that are too large.
In the wild, fish have a lot more water volume than they have in our tanks, so the more clean water they have (in general) the better. Once you've got all your water changing gear out (buckets, towels, etc), you might as well do a big change as a small one that won't have much benefit