Quite a high bioload for such a small setup,but if they are small fish it should be ok. Although you have some decent filtration, which should assist to keep it in check.
That sponge filter, why? And how often do you clean it?
Any sand in the display tank?
Are there any bioballs in overflow.
Definitely not a test kit I would use. As mentioned, have your water tested by someone else.
That sponge filter, why? And how often do you clean it?
Any sand in the display tank?
Are there any bioballs in overflow.
Definitely not a test kit I would use. As mentioned, have your water tested by someone else.