Pumps drain reservoir even when turned off

Hi John

Yes, it's me. I'm using these aquarium pumps because they've work faithfully for over a year in my first gardener:

www.amazon.com/SUKRAGRAHA-Micro-Submersible-Motor-Water/dp/B07F8JV7CT/ref=pd_bxgy_107_img_3/130-4462490-9129712?_encoding=UTF8&pd_rd_i=B07F8JV7CT&pd_rd_r=82961223-d001-4c5b-9802-0482f3a0bc1a&pd_rd_w=aBgbd&pd_rd_wg=ZsiYU&pf_rd_p=a2006322-0bc0-4db9-a08e-d168c18ce6f0&pf_rd_r=NTJ0XGZF12RACX932XSZ&psc=1&refRID=NTJ0XGZF12RACX932XSZ

However, I'm open to suggestions for improvement. In the second gardener, I find they continue to pump unless I take them out and let them dry.

This is the pump controller:
www.amazon.com/SainSmart-101-70-101-4-Channel-Relay-Module/dp/B0057OC5O8/ref=asc_df_B0057OC5O8/?tag=hyprod-20&linkCode=df0&hvadid=309833041189&hvpos=1o9&hvnetw=g&hvrand=14836870482722153843&hvpone=&hvptwo=&hvqmt=&hvdev=c&hvdvcmdl=&hvlocint=&hvlocphy=9031012&hvtargid=aud-829758849484:pla-435415527109&psc=1

I only use pumps 1,3,4 because when I hook up pump 2 - Raspberry Pi Zero W reboots when the controller shuts off. I've tried different GPIO pins all with same result. Here's the current wiring config:

GND – GND
IN1 – GPIO 20
IN3 – GPIO 16
IN4 – GPIO 26
VCC - 3v

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