C.w.deegan
Aquarium Advice Regular
I wanted to redo my 20 gal tank, I removed all the fish and snails and drained the tank completely removed the sand substrate (wanted to do a glass bottom) then replaced the decorations rocks and driftwood I am still using the same well established filter and media my question is would the 100 percent water change and removing the sand have crash my cycle. I haven't added the fish back in yet they are in a different tank for they time being.i can always re cycle the tank I just want to know if it's necessary or not