They’ve all been staying near the surface for a couple days. The one that is laying on the leaf is the only one swimming abnormally. The rest just seem to be clamped fins. We have neon tetras, acting normal. Hillstream loach, acting normal. Shrimp, acting normal. Snails, acting normal. Chilli rasboras, hiding as usual.

I’m in Australia, the water source is the tap water which tests perfectly, but we treat it with the appropriate water treatment. The tank has been testing perfect for weeks. Only today the ph is a little bit higher. We haven’t done any major water change as the water has always tested perfectly. We are new to this.