tds

Have had my gulper almost 4 weeks and I think he finally ate his first meal last night. Anyone know what they act like after they've eaten? It was just a gourami so not big, but he seems stressed and the only thing other than eating must be pH which I've managed to keep at 7 even though my...

I tried scouring the net for acceptable readings for freshwater aquarium as well as for the fishes i have but can't find any results that is useful i know what is TDS but not sure how does it help with regards to maintaining good water quality for fishes what i can say is i did a test before...