I have my booster pump on a hydros WiFi single outlet switch. For the sink if this is just drinking water then yes you'll need a tank otherwise it will just come out at that rate. Mine is sitting on its side to fit and it looks like you have enough room down there.
The clam needs a good spot to attach to (Maximas and croceas need to be on rock ideally). Try to find a piece of flat or concave rock for it to settle into. Also how much light is it getting?
Ugh don't make me create an account on that hellsite lol. I want to support you and @robert4025 but I can't stand how they censor the LGBTQ+ community.