You can always find a filter screen or a prefilter sponge that will fit on the intake of your AC 50. I use them on AC 70s on my shrimp tank. While I bought my filter screen on Aquabid, I believe there are a couple of guys on this forum that make them as well. If you get a prefilter sponge just make sure it is dense enough to keep baby shrimp safe. I use also use sponge prefilters on my AC 70's and I do not have any issue with water flow as you experienced.
You could always add a couple of small-med sponge filters and just use those on a shrimp tank as well. Plenty of people here only use sponge filters. They are inexpensive, safe and effective.
Personally I can only recommend Cobalt Aquatics Neo-Therm heaters. They are more expensive but they are high quality, cosmetically superior, and extremely accurate. You can buy them from cobalt aquatics website or amazon. For a 20 gal you would want their 75W heater. I recently posted a video review on the Neo-Therm heaters on my youtube channel. click the link in my signature and check it out.
Good luck.
You could always add a couple of small-med sponge filters and just use those on a shrimp tank as well. Plenty of people here only use sponge filters. They are inexpensive, safe and effective.
Personally I can only recommend Cobalt Aquatics Neo-Therm heaters. They are more expensive but they are high quality, cosmetically superior, and extremely accurate. You can buy them from cobalt aquatics website or amazon. For a 20 gal you would want their 75W heater. I recently posted a video review on the Neo-Therm heaters on my youtube channel. click the link in my signature and check it out.
Good luck.
