I hope I am worrying about nothing but wanted to get some advice from others...
I have inherited a 40 gallon tank
which has been fully cycled for about 1.5 years. It is well planted
with a sand substrate
and has 2 filters
0, nitirite 0, nitrate
30, KH 8, temp: 80.
Yesterday I added 6 juvenile angelfish - their body size is about 5 cm top to bottom, excluding fins - which are all brothers/sisters from the same brood. Other tank inhabitants are a pair of 6 cm Bolivian Rams and a pair of 4 cm Dwarf Flag Cichlids (Laetacara Curviceps).
Since I added the angelfish, they have seemed fairly stressed and spend a lot of time hiding between the plants
or behind the driftwood
although they did come out to eat bloodworm and brine shrimp
last night. I have also noticed that they are sometimes clamping their dorsal fins although there have also been periods of time when I have seen them with their fins nicely spread.
Is it normal for them to be quite stressed for the first few days and should I be worried about their dorsal fins?