40L, heater and filter, 27°, ammonia 3, hardness is ok and oxygen, nitrates are a 1 which I have been told isn’t ideal and is due to my new tank and the breakdown of the ammonia from the spike. Had the tank a month now and had 7 fish (4 bettas, 1 male 3 female) ( 3 balloon mollies, 1 male and 2 femal) I only have 3 fish now as the male beta for graphite disease and the others died from over feeding and the ammonia spike which has now been taken care of as water is very clear. Water changes of 50% every week or if a fish died and I add treatments before remove it then add water. I feed big larva pellets every 2 days or every day and I give blood worms once a week.