Gluteraldehyde is, in fact, degraded by photons in the UV spectrum. It is commonly used in my field of work and always in an opaque, covered container. You may want to reduce your photoperiod as well since that would have a dual effect of less gluteraldehyde degradation and less light for the algae. In high concentrations it needs 8-12 hours to work so I wouldn't be suprised if it takes at least 8-10 days in the concentrations that overdosing Flourish Excel would produce. Contact for humans isn't a problem so I would assume the plants and animals should be fine if you don't overdo it.
Brian
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