Hey guy, welcome to waterfarm. One thing I noticed about your system, is that you really don't need that plate. Algae is normal, and nothing to worry about. As far as splash is concerned, just push the ring down as far as possible, which should take care of that. Lastly, your plant looks like it needs a dose of N. Also don't forget to monitor your PH, which you should do every other day. Simply twist down your water level tube and drain into a milk jug, and drain to fill the gallon jug (waterfarm's hold 2 gal) and test your PH. If your reading a high number (most likely) adjust to 5.4 /5.6 and dump it back in, to acquire the desired 5.8. Same if too low, adjust to 6.0/6.2 and dump it back, allowing for drift.
I would change the solution completely every 2 weeks to maintain a good, fresh balance of nutes and PH. Simple enough to do using the water level tube. Good luck.