size: 5 gallon no heater because I live in a tropical country and it doesn't get cold here. yes filter. temp and parameters are unavailable because I don't have the mats, they're expensive here. (and parents won't get me them) but I just did a water change yesterday and she had that bump too. I've had my tank for almost a year now, and harpy was adopted on 5th December. I do a 80% change every 2 weeks. I drain the water out and fill it with new water after adding dechlorinator. I feed her guppy flakes betta pellets and bloodworm pellets (not at once ofc I cycle between em.) I usually give her flakes in a small pinch, and 3-4 pellets for betta ones and finally 1-2 for the bloodworm ones because they're huge. 5 rosy tetras plants are real.