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Discussion Starter · #1 ·
Hello,

I am building a 90L planted tank and would like something cheap for a CO2 system apart from a DIY yeast. I was wondering which one should I get:

1. Tetra co2 optimat - 18 EURO replacement bottle 8 EURO
2. Fluval Mini co2 reactor - 120 EURO replacement bottle 18 EURO
3. Sera CO2 system without PH controller - 340 EURO
4. DIY CO2 - have no idea on how to do it or if I can get what I need

I dont want to spend alot of money but I dont want to waste money on something it will not work so if the 3rd option is the one that will work then so be it.

Please advise.

Thanks!
 
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