I don't think a pressurized CO2 system need cost you at least $400. I believe several people have put them together for considerably less than that. I'm pricing out the pieces to do one and even being a bit lazy and not completely DIYing all the components I don't think I'll be anywhere near $400 Canadian even.
DIY CO2 isn't the biggest deal in the world, no, but for a large tank, sorry, it does become a bit of a hassle and your CO2 levels aren't consistent. CO2 tank refills aren't that expensive and are required very infrequently, so after the initial outlay I think the convenience of steady CO2 levels and one less thing to worry about is worth it, at least to me.
I'm not looking to turn this thread into an argument. If you don't find the DIY CO2 a bother then, of course, you probably would just rather continue on that way. And people do need to be made aware of all their options. For myself, I think the best option will be pressurized CO2. Obviously others may feel different.
Pimpin' the Eheim at #153
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