First off, hello everyone, I'm Joanne and brand new to freshwater planted tanks although I've been keeping reef tanks for over 20yrs. I'll give a few details of the tank that I'm in the process of fishless cycling and need your expert help with. Tank - 72 litres open top Lighting - overtank luminair 3x 24w T5, 2 Giesemann Aquaflora + 1 midday (at the moment I just have 2 tubes lit) Filter - TetratecEX700 external attached to glass lily pipe inflow/outflow C02 - disposable Hydor pressurised greenNRG with Rhinox 2000 diffuser (not suitable for solenoid that I know of so is running 24/7) Fertiliser - TPN+ and EasyCarbo. Substrate - ADA aquasoil Amazonia + power sand RO water remineralised with TMC remineral salts ( might swap to 50/50 RO+tap) PH 6.5 - 6.8 KH 4 GH 6 Do I need to run an airpump during lights out to rid excess C02 once stocked with fish ? I've tried raising the lily pipe a bit but it makes an awfull racket, it's in my daughters bedroom. The aquasoil is still leeching ammonia which is at 0.5mg/l today, its been running for 3 weeks now and I'm changing 6 gallons each day, if I changed 50% every day I would have to turn the filter off because it sucks air after 6gal. I'm dosing 3.5ml TPN+ per day and 1.4ml EasyCarbo, not sure if this is too much or not. Any advice will be much appreciated if you spot anything I'm doing wrong.