Dang that's awesome dude, I gotta check out your tank to see them. Do you have a youtube video?cardinals get much larger, but once established are much MUCH hardier and as mentioned, more colorful with time.
I started with a school of 100 very small cardinals in 240 gallons, its been a year with them and i still have over 85, and they are 2" long each.
The 404B is pretty good! It actually matches the flow of the RenaXp3 if you have ever had one of those. Definitely not the 500+ GPH it states, but it gets the job done. I would say you'll be fine if you have one on a 48 gallon tank.Great looking tank. Curious what your thoughts are on the Sunsun 404B as far as flow out put? Does it seem high, low, medium? I'm thinking of using one on a 48 gallon tank and was wondering if the out put would be enough or might need a power head to maintain adequate flow?