LesleyFish;2358815; said:I think it's too much of a pain at this point, the gravel I have in now is completely bacteria laden and good for a fishy tank. I really want to do sand but it is also incredibly hard to change substrates with a full tank.
really not hard to change, but it's a risk because most bacteria is in your gravel. unless your filter has been running for long time and have enough filteration to back it up.
Also piranha are hardy fish, you can still change subtrates.
