Just like any other fish 50% once a week should be good. As long as the tank is not over stocked. Too heavy of a stock level will cause whats known as old tank syndrome. Which causes ph crashing or low ph and high nitrate levels. The ph swings are pretty harmful to all fish.Greg31;3730973; said:While this thread is somewhat active.
Best substrate?
Since they spend a good amount of time on the bottom personally I woulddo something softer. Like sand or pea gravel. Regular gravel might cause some irratation. But wolf's are pretty tough skinned so even regular aquarium gravel would probably be just fine.
Waterchanges?