i have a 90l tetra tank with the standard tricle filter. i have a mini air pump and 5 real plants. my fish are 4 neons, 2 black mollies, 2 plattys, and an otto sucker and 2 tiger barbs which 1 seems to have lost a bit of colour. the mollies spend a lot of time around the top and the plattys on...
Im starting to worry that my fish are swimming to the top of the tank and spending a lot of time there and also around the filter. Ive also saw some sitting on bottom and on the plants. Is there a reason for this and can someone advise me of the perfect way to fix this problem. My tank has just...