Rescaping my tank. Add New aquasoil or keep all the old?
Im going to rescape my 29 gallon soon. I have some 2 year old aquasoil in there thats been through many different scapes. I have about 1/4 bag of unused aquasoil laying around. Should 1:
1. toss all the old aquasoil and redo the substrate completely with new aquasoil (save for a bottom layer of old AS for bacteria)
2. Mix in the 1/4 bag of new aquasoil in with the old stuff.
3. Keep it the way it is with the aged AS and save the fresh AS for a different project.