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The problem with diy is the fact that it can be so variable depending on the status of the culture. Having said that, many people use it on tanks up to 55gal and are very happy with it. You don't mention how big your tank is, but your levels are quite high. Actually using Chuck's calculator with your pH of 6.5 and KH at 6.5, you have 61ppm of CO2. You say your fish aren't stressed, I'd be careful if I were you. Or perhaps your test kits are off.

Bottom line is if it's working for you, you're OK. But if your CO2 levels are indeed that high, I would be concerned especially at night, and with such a high fish load. HTH.
 

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1. I had diy on a 29 gal before I switched to pressurized and my levels never got that high, that's not to say yours can't.

2. Anything that affects pH will throw off your readings, such as buffers. Otherwise, I believe it is thought that often you will actually have an underestimation of your co2 levels rather than overestimation using the kh/ph relationship. Bottom line here is if your fish are ok, I wouldn't worry about it.

3. Why not build a simple reactor and plumb it in line to your filter. Nothing extra in your tank and the efficiency is much higher. People have reported some issues with using the cannister as the reactor.

HTH.
 

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Yildirim,
Look here for Gomer's reactor. You can go cheaper if you use regular pvc instead of the clear one for the center. Then just plumb it into the return side of your filter, ie, rather than have the return hose go directly into the tank, have it go through the reactor first, then the tank. These systems work great with cannister filters.
 
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