A 29 gallons is far from sufficient for a ray. Obviously your tank is not cycled since you have .25 ammonia 0 nitrite and 0 nitrate. You need to monitor the tank closely atm. Do 50% wc at least every other day and hope for the best until this tank is fully cycled.The filters have seasoned media. I can move the ray to a 29 gallon. I'll get some covers for the heaters asap