Re:help i am new to this

Hi Stephanie,

Welcome!!

I would go with the 45 if you can. It should be tall enough. 21 tp 24 inches should be tall enough for most of the captive bred seahorses available these days. Most LFS can order taller than standard height tanks if you are looking for more height. To be honest the taller tanks IMO are a pain to clean. 24 inches is about my max.

In addition to live rock and sand I like hang on the back filters. I find they are easier to get to for cleaning and media changes. I do not like canisters at all. I find them harder to get to. I make much more of a wet mess when I work on them, than I do the hang on the backs.

I would recommend Sunbursts or Mustangs or both for your first seahorses. They are a nice hearty beginners seahorse.

Hope this helps,

Leslie