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Re: CO2 in a low light tank

> Conclusion:  Be cautious  pushing CO2 to high levels with submersed Crypts
> at very low light levels.

I've tested the CO2 levels closely in a 55 gallon tank with 1.6 watts per
gallon and have not seen what you described using the same plants(C cordata
var and wendtii) I ran the CO2 to the point of killing shrimps(about 100ppm)
then dropped back for about an average of 25-30ppm over the course of 6
months. Growth was incredible and no melting. You had a tad less light(1
watt gallon or less). This may account for some of this. They were NO FL's
lights as likely was your set up. The crypts in the tank were:

C. cordata var blassii
C. crispatula var balansae
C.    "        "  yunnanesis
C. pontederiifolia
C. undulata
C. usteriana
C. spiralis
C. albina

None showed signs of melting.

Tom Barr