Amonia Spike, What To Do?

[Davy]

A well established tank, trigon 190, Nitrate 0, Amonia (was 0) PH almost 7 Nitrate (low) - stocked with one black moor, one veiltail, one telescope, one redcap, common goldie (rescued from a ballygowan bottle) an ancistrus, two weather loaches, hong kong pleco.

Running the internal Juwel filter alongside Eheim 2026.

Done a real detail clean the other night, 50% water change, gravel vac, all sponges in the filters rinsed (in old tank water).

The only differences in my normal clean is that I clean the pipework on the Eheim + I had no filter floss left so the juwel + eheim have none in at the time being, guy lifted it for me yesterday and will have it in tonight.

Came home from work last night and the waters cloudy, so I do the ammonia test straight away, slight spike, wouldn't be as much as 1, but what should I do and what do you reckon caused it.

 

[black angel]

As you cleaned both filters then i reckon youve upset the bacteria and its hiccuped and done a mini cycle. Do lots of water changes and keep the ammonia as close to 0 as you can. Test daily to see if you get a nitrite spike as well.
When you do a water change try and clean a filter the day before or after and alternate each week between them.

Your tank is overcrowded as well. You should allow 10 gallons per fancy and 20 for the common and thats as a minimum. The filters may have a hard time coping with the loads as it is so any hiccup as youve seen can upset the filtration.