Marshall..
Fish Crazy
I am hoping to add a substate fertiliser so that i can add plants but my aquarium is already running what is the easiest way without causing too much mess? 

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Is there no other way? I have a 350 litre tank! It is a corner tank too so I can't even reach the back with a net!best way would be to put the fish in a big bucket, put the heater and filter on that, then drain the tank, take out all the substrate, then put in the fertiliser then cap it with your substrate, other than that the only thing you can do is add root tabs.