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post #6 of (permalink) Old 01-20-2013, 09:40 PM Thread Starter
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Join Date: Oct 2011
Location: BC, Canada
Posts: 902
Originally Posted by thelub View Post
I'm just thinking out loud here, but could the BGA be coming in from your water supply? If your local water source is an open water supply like a lake, I believe it can travel in your tap water supply. If you're on a well, I'm out of ideas lol
My tap water is sourced from a lake that does have cyano colonies. Now I was under the impression that the chlorination/UV treatment process would remove this... I sure hope I'm not drinking/cooking with cyano-water.

Distinct from influxes of biologically-active pathogens from creeks and other runoff sources,
the lake itself can act as the incubating site for another class of pathogen, a type of phytoplankton
referred to as cyanobacteria or blue green algae. Many types of phytoplankton are found in Okanagan Lake.
Phytoplankton are generally not toxic, and are not a health problem, although they may present aesthetic
issues (L1). Certain species tend to be concentrated in the top 10 20 m of the water column, as revealed
in chlorophyll profiles provided by Ministry of Environment (MOE), and are generally essential for
maintenance of the ecology of the lake. The blue-green algae, referred to also as cyanobacteria, tend to
be more uniformly distributed in the water column (Larratt 2009) and some species have the
potential to be harmful because of their production of lethal cyanotoxins. The concerns with cyanobacteria
and cyanotoxins are that, unlike total coliform and E. coli, they are difficult to remove in a treatment plant,
and some species are very toxic (L2).
The concentration of cyanobacteria in lakes tends to be episodic, with large outburst of growth
known as blooms. The driver for cyanobacteria blooms is typically the occurrence of elevated nutrients.
Generally, phosphorus (P) is the limiting nutrient, rather than nitrogen (N). A previous Okanagan LakeCITY OF KELOWNA DRINKING WATER SOURCE PROTECTION
EBA FILE: V13201297 | MAY 2011 | ISSUED FOR USE
water quality study conducted by Nordin (2005) indicates that the present N:P ratio of about 28:1 is in
reasonable balance and would not encourage the production of cyanobacteria. Over the period of record
between 1979 and 2004, Nordin noted that there is a pattern of a clear phosphorus limitation in
spring and early summer and likely co-limitation by N and P in summer and fall. The record also suggested
that the concentrations of total N and P have not changed significantly over time. The variation in N and P
concentrations that has occurred is the result of inter-annual changes in hydrology. This variation also
alters the N:P ratio with higher ratios found during periods of lower run off (Nordin 2005)

I think I am going to look for some Erythromycin (Maracyn). It is very expensive here but I will check out Petsmart tomorrow. What is the dosage guidelines? Is it really safe to be low dosing antibiotics with my fish in there?
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