New 40g Shrimp Tank - Advice Wanted
Currently we have two 10 gallon planted tanks that we intend to combine into a single ~40 gallon tank. One of our 10g is a crystal red shrimp tank with maybe 150 individuals. Our other tank has maybe 20 celestial pearl danio (including juveniles, only 7 adult), 2 juvenile mystery snails, and 4 juvenile nerite snails. Both tanks are heavily planted with a variety of plants. the CPD tank is high-tech and the shrimp tank is low tech.
The new tank is a Fluval M90. It is usually intended for reef tanks with an internal sump, but I plan to tear out the divider for the filtration and use HOBs instead. Any reason I should not tear out the divider? I could use it for filtration, but it seems silly to waste 8g of tank space for filtration.
We plan to use our existing plants including java moss (large quantities), purple temple, lilaeopsis, and a few other species that I don't have a current ID for. The java moss will be a primary part of the build, with a "bonsai tree" style wood/moss arrangement on one side, and another wood/moss setup on the other side. The moss should allow better survival rates for fry and baby shrimp. The pressurized CO2 system will go to the new tank. Currently using Seachem ferts.
This tank will be a shrimp tank first and foremost. All other inhabitants need to be pretty shrimp friendly. I am ok with losing some young shrimp to the fish, as long as the population is stable or grows slowly. My primary complaint with the CPD is that my small school is very timid. They rarely leave the back corner of the tank despite having ample hiding places throughout. I love their coloration and size, but I would like to help them become less timid. I hope that increasing their school size and adding some dither fish will make them less timid. Our current plan is to stock as follows:
-Nerite and mystery snails.
-Potentially ~5 threadfin rainbows
-Potentially another schooling fish like green rasboras.
-Potentially (wife wants) 1 bamboo shrimp.
I could use help making sure I am not overstocking and am selecting species that go well together. These are pretty much all Asian species but have slightly different requirements. It looks like they all do well in the mid-70s. I will have a heater to keep things around 75F, which is on the higher range for the shrimp and on the lower range for the fish. For flow, I intend to keep flow low throughout most of the tank using two smaller HOB filters with sponge intakes. I will add a small powerhead to one end so that part of the tank has higher flow for the species that prefer it. Substrate will be ecocomplete.
Any advice or thoughts are greatly appreciated. We are set on the CPD, CRS, and snails, but really could use some help determining what other shrimp-friendly fish would be attractive and bring out the CPD. I understand bamboo shrimp are sort of their own thing, but it seems like they would be compatible with the other inhabitants as long as flow is sufficient for them. I would also really love to hear about other fish similar to threadfin rainbows that are a little larger, attractive, and semi-shrimp-safe. Thanks!
2.5g low-tech with CRS, Amano, and Nerite;
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7g Low tech cull tank.