For sure you can.
You only get a 4 port outlet with the Jr (I couldn't do it without at least 8). You can still control lights, temp pumps etc.
You would have to buy an expansion module for a pH probe if you want that capability though.
Otherwise you can easily run a tank with a Jr. When I bought mine I was told to keep in mind possible expansion. I'm glad I did as I used all 8 ports on my eb8 and could have done with a couple more too. To add another eb8 is over $160 I believe. An eb4 isn't much cheaper either so bear that in mind also.
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