Originally Posted by
danotaylor
Your nitrates are way to high and should be kept <10. Also the presence of nitrite (highly toxic even at 0.5) suggests a mini cycle. The lesions look bacterial but metro would not be the drug of choice, neither would higher temps as that accelerates bacterial growth & reproduction. I recommend large (75%) daily water changes and add salt 2-3tbsp/10gal and replace with each water change. Once the lesions are healed amend your current WC schedule or volume to keep your nitrates <10. If you have hidden areas amongst your plants were detritus gathers be sure to vacuum it out regularly as the presence of other non-measurable dissolved organic waste could be part of the root cause given your limited WC routine. Keep us posted!