They make great friends and partners to Pisces, including double Pisces (sun&moon) like me.
My only regret is that our relationships have not lasted. Three years for a friendship (we shared a house as students and then lost contact years after moving to different ends of the country). Two years for a romantic relationship that Gem ended, because he got upset with me.
They were both sensitive and very intelligent men. We used to debate till the cows came home, but almost never argued. They did not like "having space" too much, aka being left at their own devices for days, while I was doing something else. This contributed to the demise of my romantic relationship. My ex partner apparently tolerated extreme jealousy and possessiveness (Jezz, how many S this word has?!) at the hands of an Aqua, for almost 2 years on-off. I only told him once, calmly "I'm jealous" and he said he was pleased to hear it.
All in all, highly recommended. I was very happy and so were they, when physically present. Just didn't know how to make him change his mind when he decided to end the relationship. I reacted by distancing myself completely...for a year... lol.