OK looks like I made a mistake - res temps are hovering around 60 - 62.5 degrees fahrenheit (my mistake converting Celsius to Fahrenheit) & room temps are between 70 - 72

still think res temps are a little on the cold side and I appreciate suggestions of how to raise temp and intend to use them

have seedlings right now being fed no nutes as of yet, PH between 5.5 - 6.0 (always shooting for 5.8) and a few of them look a little yellow although they still growing

think it could be because of res temps and/or the reservoir water is filtered tap water which is very hard at about 450 ppm. going to get a RO water maker and add some CalMag plus so I know what I'm working with