Just take everything out of the tank first. Then rinse it out. Put the filter (without media) heater (if you have one) and what ever else you put in the aquarium and fill with water. Dump bleach into the tank, don't worry you really cannot use to much. Run the filter of the tank for 24 hours with the bleach water. Empty the tank and rinse it out. Refill the tank with water after rinsing and set everything back up and then add a big overdose of dechlor. Use new substrate or go through the same process as the tank to clean the sand/gravel, unless it is and aquasoil or something. Only put clean plants back into the tank. Use H202 or potassium permangenate (sp?) to dip and rinse the plants before being returned.
I think that is everything. Hope I covered everything! Hahaha!
I think that is everything. Hope I covered everything! Hahaha!