its not the only cause. low flow also is a factor. and decay (just my observation however).
not the only way. some people beat it like a regular algae, others used etheromycin (spelling?). its the antibiotic in maracyn.
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Eheim Pimp #296 Eheim Ecco 2232 (x2), Eheim Ecco 2234 (x1)
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