

Spikes after water change. Assassins the reason ?
I think I may know, might be overstock with the amount of assassin snails, 30G have 12 Corys ( adopted mix ) groups of 3, one crowntail, 7 normal lampeye and another adopted Sia Algae eater called jimmy. I’m running two filters.
The issues Believe might be linked to the breeding of amano shrimp, I can see around 20/30 in the tank, and I counted 70 assassin snails…… mix of baby’s and adults, also have bladder snails.
I’ve only notice spikes after water change, 50% - all the assassins come out, pre this level of assassins water change every week T 25% and levels seemed fine.
I know assassins don’t effect bio load too much, but 70 ? nitrite levels spike then go down after 2 days. Use prime, so I’m guessing an ammonia spike after water change, could be linked to the assassins all coming out ?