Hey Stoo, nice looking ryukus (did I spell that right) very pretty fish. Little tip I can give you. If this is a show tank, or a tank that is out in the open for any quest to see. You may want to get a vac so you can do a quick poo removal if guests are coming over.
It's a great thing to have for bare bottomed tanks you want to clean up a little with out having to drag out buckets, and pythons and go thru the rigors of a water change.
My fav gravel vac is the cheap on that is powered by an airline. I find that it really works well if you have a powerful air pump hooked up to it and replace the net collection bags it comes with for something a little less porous. You should be able to find new bags next to where you find the vac. The battery powered ones do really work the best, but the problem with them is they rust if they get wet. Yeah that burnt me up. How is a company gonna make something that is meant to be placed inside a tank, but it dies if it gets wet..go figure. I went thru 3 battery ones before I decided to give the elcheapo model a try.