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  1. Hi all, I am trying a hi tech planted tank with a few tetras, cories, and loaches for the first time. I need some advice to figure out what the circulation pattern is in a 45g tank with a Marineland Emperor 400 HOB. My tank setup is shown in the image below: Right now I have the CO2 diffuser to the left of the HOB at the back. My C02 indicator on the other side of the tank and to the front. I am diffusing CO2 with the Aquario Neo Co2 Diffuser (Large) at the rate of 2 bubbles/second. However my NilocG Aquatics Co2 Drop Checker is not turning green. I was wondering what would be the best course of action for me to get better Co2 circulation? 1. Move the Co2 diffuser to another location. Maybe the other end (right of HOB) of the aquarium at the back? 2. Get a nano circulation pump. Where would I place and aim this pump? 3. Switch from HOB to a canister filter and use it's movable intake/outlet to create circulation. 4. Increase the Co2 bubble rate slowly each day till the indicator turns green. Any advice is appreciated!!
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