The loaches should be fine for awhile (maybe a year or so)...they grow slow. A 55g isn't a good permanent home though, so if you plan to keep them a long time, I'd think about upgrading their tank in a year or so.
The common plec will also outgrow the 55g. He will get around 12 inches. He will probably fit fine, but will probably feel a little cramped when he is full grown.
My bristlenose's color changed after I got him...but its still the same. I think he just grew and his color changed some. I didn't see him very often, so I freaked out and thought something was wrong...but he was fine.
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*Kristin*
5 Planted tanks:
55g, 40g, 29g, 20g, 5.5g
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