caitlynnanne9189
Aquarium Advice FINatic
Have a 3 gallon tank that currently has 2 guppies in it and I'm looking to redo the tank. I bought new gravel yesterday. Did the black with a few brightly colored rocks in it. I want to change the gravel and I'm also getting a new filter for it in 3 weeks probably. Is it ok to change out the gravel with the old filter running or should I wait till I'm going to add the new HOB filter to change that? And! Should I take the fish out when I do this?